單項(xiàng)選擇題The greatest strain,when lifting a load with the jumbo purchase,is on().

A.all of the parts,dividing the load equally
B.the hauling part because it must absorb the frictional losses of all the sheaves
C.the parts in the movable block
D.the standing part because it is directly connected to the weight


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2.單項(xiàng)選擇題Sea water temporarily pumped into tanks to simulate the increased vertical loading of environmental forces is termed().

A.preload
B.liquid variable load
C.fixed load
D.basic load

3.單項(xiàng)選擇題Prior to backloading portable tanks or drums onto an offshore supply vessel,check that each tank is().

A.painted yellow with diagonal black striping
B.capped and checked for leaks
C.coated with non-corrosive protection
D.mounted on pallets

4.單項(xiàng)選擇題Large quantities of uncovered pig iron or billets should not be carried in the upper-tween decks because().

A.this does not eliminate the risk of cargo shifting
B.this will increase the metacentric height of the ship
C.this will decrease the gravity height of the ship
D.this will reduce the rolling period of the ship