Which of the following components means water？

Which of the following components provides a direct source of seawater for the fire main system?

A.Rose box

B.Sea chest

C.Sluice(闸式) valve

D.Fire pump stuffing box

Which of the following is true?

A．Water evaporated to atmosphere is unavailable to man because it is from useless plants.

B．Man can interfere with water evaporation by growing some plants.

C．Man can recycle evaporated water to grow useful plants.

D．Useful plants can collect the evaporated water which will be used for other purpose.

Which of the following statements about the water on Venus is true?

A．The water evaporated because of the high temperatures.

B．The water became frozen in the polar regions.

C．Only a little water is left in small lakes on the surface.

D．Rain does not fall because there is no atmosphere.

Which of the following polymers with little water-absorption resistance?

  A．high-density polyethylene     B．nylon 6/6

  C．fluorocarbons               D．polyester

Which of the following statements is INCORRECT?

A．Cleaning products should look like water.

B．Many products have chemicals and false colorings.

C．Food with synthetic chemicals is harmful.

D．The low-lying chemical isn't detrimental to children.

For proper operation, auxiliary boiler feed water must have which of the following characteristics?

A.High oxygen concentration

B.Low pH

C.Proper alkalinity

D.All of the above

Which of the following is the immediate effect of the first Earth Day? 查看材料

A.The Environmental Protection Agency was founded.

B.Congressional Protection for water was passed.

C.There are more demonstrations followed.

D.Denis Hayes published his Clean Energy Now.

According to water expert Gleick, which of the following measures can solve water related problems?

A.The governments should build small-scale dams.

B.The governments should build huge and disruptive projects.

C.The governments should find more accesses to basic clean drinking water.

D.The governments should try hard to make sure everyone have a resource.

Which of the following sentences is INCORRECT?

A．Fire and water do not agree.

B．Each minute and each second are valuable.

C．Bread and butter is a nutritious food for patients.

D．The scholar and poet is dead.