单项选择题
The （）(笨重货) must be handled by jumbo boom or shore crane.
A. awkward cargo B. drummed cargo C. cased cargo D. heavy cargo
单项选择题 Renew the （）(稳索), please.
单项选择题 The（）(贵重货) must be kept carefully.
单项选择题 The （）(支索)is important to a derrick.
