单项选择题
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
单项选择题 The（）should ensure that the holds in which chemical packages are stowed are properly supervised during the loading operations and these packages are regularly inspected for leakage or damage on the voyage.
单项选择题 Sea water temporarily pumped into tanks to simulate the increased vertical loading of environmental forces is termed（）.
单项选择题 Prior to backloading portable tanks or drums onto an offshore supply vessel，check that each tank is（）.