影响磨削加工后表面粗糙度的因素包括（） The factors affecting the surface roughness of the ground surface include （).

Reducing free surfaces has the effect of lowering the ______.

A.uncorrected KG

B.virtual height of the center of gravity

C.metacenter

D.metacentric height

Which factor has NOT converged to make this hurricane season one for the record books?

A．Long-term cycles affecting the ocean and atmosphere are at play.

B．Strong El Nino episodes whose long-range reach generate wind patterns over the Atlantic that suppress the formation of hurricanes.

C．A weak El Nino in the eastern tropical Pacific.

D．Unusually warm sea-surface temperatures in the eastern Atlantic.

We went fishing the first morning. I fell the same damp moss covering the worms in the bait can, and saw the dragonfly alight on the tip of my rod as it hovered a few inches from the surface of water. It was the arrival of this fly that convinced me beyond any doubt that everything was as it always had been, that the years were a mirage and that there had been no years. The small waves were the same chucking the rowboat under the chin as we fished at anchor, and the boat was the same boat, the same color green and the ribs broken in the same places, and under the floorboards the same freshwater leavings and debris—the wisps of moss, the rusty discarded fishhook, the dried blood from yesterdays catch. We stared silently at the tips of our rods, at the dragonflies that came and went. I lowered the tip of mine into the water, tentatively, pensively dislodging the fly, which darted two feet away, poised, darted two feet back, and came to rest again a little farther up the rod. We would be tired at night and lie down in the accumulated heat of the bedrooms after the long hot day and the breeze would stir almost imperceptibly outside and the smell of the swamp drift in through the rusty screens. Sleep would come easily and in the morning the red squirrel would be on the roof, tapping out his gay routine.

Interface features are regarded as a type of adhesion phenomenon and are often interpreted in terms of the surface structure of the bonded material. Which are the major factors to be considered in explaining the adhesion phenomenon?

  A．The color, surface electric resistance, free radical groups, and roughness of the material to be bonded

  B．The weight, surface free energy, smell, and roughness of the material to be bonded

  C．The wettability, surface free energy, polar groups, and roughness of the material to be bonded

  D．The thickness, surface free energy, polar groups, and flatness of the material to be bonded

32-35 The following is an abstract of a published paper. Read it through and look for the following purpose of the sentences. Abstract: A) The present research examines how the molecular weight of PAA affects its influence on the crystallization of CaCo3. B) Factors of calcium concentration and temperature were monitored in heated supersaturated solutions containing PAA samples which raise the temperature necessary to induce crystallization. C) Testing of mixed molecular weight distributions demonstrated that high molecular weight species govern the observed inhibition influence. D) An equation was also developed for predicting the influence of a mixed molecular weight distribution on crystallization temperatures at unsaturated surface conditions, assuming each polymer species produces a specific crystallization temperature. E)The microstructure of these crystals indicates the roughness results from the aligned aggregation of crystallites on the surface of existing crystals in a process that resembles a form of self-assembly. 32. Purpose of the study： 现在请填写第32题答案。（填句子前面的大写字母即可）

There are many reasons for tidal action; thus, tides are very complicated phenomenon involving many factors, all of which must be considered to predict tidal action in any one place at any given time. The alternate rise and fall of the surface of the seas and the oceans is mainly caused by the attractive force of the moon. When the attraction is great, the tide is high; conversely, when the attraction is minimal, the tide is low. Between the high tide and the low tide is a period of a little over six hours, being called during its rise a flood tide, and during its fall an ebb(退潮) tide.

The sun also exerts its effect on the tide, being a little less than half as much as the moon, although its mass is so much greater. When the moon and the sun are horizontal, the highest tide occurs and when they are vertical the lowest tide takes place.

The wind also plays an important part in the modification of the normal rise and fall of the tides. Thus these factors affect each other, either detracting(转移) or adding to the attractive forces to add or subtract from the magnitude of the tide. One thing is certain: the tides move inexorably(不可阻挡) on, rising twice a day, shifting a little in time each day, and coutinually posing the problem of how to correctly predict their highs and lows.

The principal idea of this article is ______.

A．the attraction of the sun and the moon

B．the sun, the moon and the wind

C．the changing tides

D．the factors affecting the tides

According to Ed Overton, the effects of oil on the surface of the ocean______.

A．will be very obvious

B．are a complete mystery

C．are not measurable

D．remain modest at present

什么是表面光整加工技术。 What is the surface finishing technology.

There are many reasons of the tidal action which is a very complicated phenomenon involving many factors all of which must be considered to predict tide in any one place at any one time. The alternate rise and fall of the surface of the seas and the ocean is mainly caused by the attractive force of the moon alone. When the attraction is great, the tide is high; and conversely when the attraction is minimal, the tide is low. Between the high and the low tide is a period of a little over six hours, being called during its rise a flood tide, and during its fall an ebb tide.

The sun also exerts its effect on the tide, being a lit fie less than half as much as the moon, although its mass is so much greater. When the moon and the sun are horizontal, the highest high tide occurs and when they are vertical the lowest low tide takes place.

The wind also plays an important part in the modification of the normal rise and fall of the tide. Thus these factors affect each other, either detracting or adding to the attractive forces to add or subtract from the weight of the tide. But the tides still move inexorably on, rising twice a day, getting a little later each day and posing a problem of correctly predicting their heights and lows.

Which of the following factors will not affect the time of the tide?

A．The position of the sun and the moon.

B．The mass of the moon.

C．The wind.

D．All of the above mentioned factors.