When ship navigating in rough sea, the correct operation is .A.navigating with a low diese

A.prevent the diesel engine surging

B.prevent governor from being damaged because of swing

C.reduce the probability of the crank shaft being torsional vibrated and resonated

D.prevent the main engine being overload or overspeed

t the overload should be .

A.cleaning fuel oil, lubricating oil and seawater filter

B.reducing fuel feeding of the main engine appropriately or reducing the pitch angle of propeller

C.using low sea chest

D.closing the skylight and the ventilation opening, which doesn’t affect the normal work of equipments

A.rapid reduction of ship’s friction force

B.shaft system over mechanical load

C.sharp growth of the torque of diesel engine

D.propeller torque change along J= 0 curve

ship？

A．Wood for the construction of sailing ships became scarce.

B．The steamship could travel at faster speeds than the sailing ship.

C．Steamships were better than sailing ships at navigating canals.

D．Technical advances made the steamship require less coal.

currents of the Pacific. When weather prevented the Chinese from navigating by the sky their mariners(水手) used magnetized(磁化) needles to guide them. Because the sailors had no level surface on their rocking ship, they floated the needle in a shallow bowl of water, and the compass that guided explorers to day was born.

Between 1450 and 1433, Emperor Chu Ti's Treasure Fleet of the Dragon Throne ruled the entire south Pacific and the Indian Ocean, collecting gifts and tributes(贡品) for the Emperor throughout a territory that ranges from Korea and Japan to Eastern coast of Africa. The Admiral Cheng Ho began the first of seven voyages in 1405. The purpose of the first voyage was to hurt the former emperor who had been dethroned and escaped. The admiral's fleet, which was made up of 62 large junks and 255 smaller ships, recaptured the deposed emperor and also defeated a large pirate fleet that had been terrorizing the islands near Sumatra. Over the next 28 years, Admiral Cheng Ho increased China's trading territory to including 37 countries from the Vietnam coast to Persian Gulf, the Red Sea, and eastern Africa. Cheng He's death around 1435 signaled the end of the Treasure Fleet and disappearing of China's economic domination of the South Pacific.

It is implied but not stated that ancient navigation used to sail ______.

A．with their knowledge of the winds

B．by the sky

C．by the compass

D．by the currents of the Pacific

tion to be accurate to within a radius of ______．

A.10 meters

B.20 meters

C.50 meters

D.100 meters

Task 1

Directions: After reading the following passage, you will find 5 questions or unfinished statements, numbered 36 through 40. For each question or statement there are 4 choices marked A, B, C, and D. You should make the correct choice.

By the first century A. D., historians say, the Chinese had some knowledge of the winds and currents of the Pacific. When weather prevented the Chinese from navigating by the sky their mariners(水手) used magnetized(磁化) needles to guide them. Because the sailors had no level surface on their rocking ship, they floated the needle in a shallow bowl of water, and the compass that guided explorers to day was born.

Between 1450 and 1433, Emperor Chu Ti's Treasure Fleet of the Dragon Throne ruled the entire south Pacific and the Indian Ocean, collecting gifts and tributes (贡品) for the Emperor throughout a territory that ranges from Korea and Japan to Eastern coast of Africa. The Admiral Cheng Ho began the first of seven voyages in 1405. The purpose of the first voyage was to hurt the former emperor who had been dethroned and escaped. The admiral's fleet, which was made up of 62 large junks and 255 smaller ships, recaptured the deposed emperor and also defeated a large pirate fleet that had been terrorizing the islands near Sumatra. Over the next 28 years, Admiral Cheng Ho increased China's trading territory to including 37 countries from the Vietnam coast to Persian Gulf, the Red Sea, and eastern Africa. Cheng He's death around 1435 signaled the end of the Treasure Fleet and disappearing of China's economic domination of the South Pacific.

It is implied but not stated that ancient navigation used to sail ______ .

A．with their knowledge of the winds

B．by the sky

C．by the compass

D．by the currents of the Pacific

receiver is locked onto ().

A.Horizontal Dilution of Precision

B.Selective Availability

C.Doppler Shifting

D.Precision Coding

Task 1

Directions: After reading the following passage, you will find 5 questions or unfinished statements, numbered 36 through 40. For each question or statement there are 4 choices marked A, B, C, and D. You should make the correct choice.

By the first century A.D, historians say, the Chinese had some knowledge of the winds and currents of the Pacific. When weather prevented the Chinese from navigating by the sky their mariners(水手) used magnetized(磁化) needles to guide them. Because the sailors had no level surface on their rocking ship, they floated the needle in a shallow bowl of water, and the compass that guided explorers to day was born.

Between 1450 and 1433, Emperor Chu Ti's Treasure Fleet of the Dragon Throne ruled the entire south Pacific and the Indian Ocean, collecting gifts and tributes(贡品) for the Emperor throughout a territory that ranges from Korea and Japan to Eastern coast of Africa. The Admiral Cheng Ho began the first of seven voyages in 1405. The purpose of the first voyage was to hurt the former emperor who had been dethroned and escaped. The admiral's fleet, which was made up of 62 large junks and 255 smaller ships, recaptured the deposed emperor and also defeated a large pirate fleet that had been terrorizing the islands near Sumatra. Over the next 28 years, Admiral Cheng Ho increased China's trading territory to including 37 countries from the Vietnam coast to Persian Gulf, the Red Sea, and eastern Africa. Cheng He's death around 1435 signaled the end of the Treasure Fleet and disappearing of China's economic domination of the South Pacific.

It is implied but not stated that ancient navigation used to sail ______.

A．with their knowledge of the winds

B．by the sky

C．by the compass

D．by the currents of the Pacific

A、A．station the lookout in the wheelhouse to keep a continuous watch on the radar

B、B．secure the sounding of fog signals until a vessel closes within five miles

C、C．station a lookout as low down and far forward as possible

D、D．keep the radar on the shortest available range for early detection of approaching vessels