题目
A. to use gloves to pick up the item.
B. to squat and lift from the legs.
C. to have two people bend down and pick the item up.
D. to bend down and lift the item up.
第1题
Which safety precaution(s)should be observed during crane operations ________.
A.Checking for proper lifting from beneath the load during cargo operations
B.Using the proper slings or other lifting devices during cargo operations
C.Relaying communications to port agents on the pier during cargo hoists
D.All of the above
第2题
Mechanical lifting of air by the upslope slant of the terrain is called ______.
A.vertical lifting
B.convective lifting
C.advective lifting
D.topographic lifting
第3题
A. Switches 1, 2, 3, and 6 will part icipate in the multicast tree once pruning has taken place.
B. Switches 2 and 6 will participate in the multicast tree once pruning has taken place.
C. Switches 1, 2, 3, and 6 will participate in the multicast tree.
D. The multicast server is the rendez vous point of the multicast tree.
第4题
The universal lifting spreader is a lifting device used on ______.
A.dockside container cranes
B.shipboard container cranes
C.straddle trucks
D.straddle cranes
第5题
第6题
第7题
A.The rocket should be inexpensive to construct.
B.The rocket is capable of lifting heavy spacecraft into orbit.
C.The rocket should be easily controlled.
D.The rocket should be inexpensive to operate.
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