你可能感興趣的試題

單項(xiàng)選擇題

For any given pedestal crane，when the boom is lengthened，the lifting capacity is（）.

A.unchanged
B.increased
C.eliminated
D.decreased

單項(xiàng)選擇題

For a given weight of cargo，the stress on the heel block of a cargo boom（）.

A.increases as the cargo closes the head while hoisting
B.increases if the cargo runner is doubled up
C.decreases as the boom is topped to a greater angle
D.is determined by the thrust stresses on the boom

Oil product samples should be taken from the（）.

你可能感興趣的試題

For any given pedestal crane，when the boom is lengthened，the lifting capacity is（）.

For a given weight of cargo，the stress on the heel block of a cargo boom（）.

For any given pedestal crane，when the boom is lengthened，the lifting capacity is（）.

For a given weight of cargo，the stress on the heel block of a cargo boom（）.