單項(xiàng)選擇題A thin，whitish，high cloud popularly known as “mares’ tails” is（）.

A.altostratus
B.stratus
C.cumulus
D.cirrus


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1.單項(xiàng)選擇題A tank 36 ft. by 36 ft. by 6 ft. is filled with water to a depth of 5 ft. If a bulkhead is placed in the center of the tank running fore-and-aft along the 36-foot axis，how will the value of the moment of inertia of the free surface be affected?（）

A.The moment of inertia would remain unchanged
B.The moment of inertia would be 1/4 its original value
C.The moment of inertia would be 1/2 the original value
D.None of the above

2.單項(xiàng)選擇題A tackle is “two blocked” when the blocks are（）.

A.equally sharing the load
B.jammed together
C.as far apart as possible
D.rove to the highest mechanical advantage

4.單項(xiàng)選擇題A survival craft being used to pick up a person who has fallen overboard from a ship should approach the person（）.

A.at a high rate of speed
B.under oars
C.against the wind
D.with the wind

5.單項(xiàng)選擇題A sufficient amount of chain must be veered when anchoring a vessel to ensure（）.

A.the vessel has enough room to swing while at anchor
B.the anchor flukes bite into the ocean bottom
C.there is a sufficient scope of chain to keep the anchor on the bottom
D.there is more chain out than there is in the chain locker