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单选题
Chain slings are suitable for heavy slender articles，such as（）.
A
timber or steel rails
B
locomotives or boilers
C
railway passenger coaches
D
motor vehicles
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单选题When using slings，cargo handlers should take all the following precautions except（）.A
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考题
名词解释题heavy-chain binding protein, Bip (重链结合蛋白)
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