单选题Chain slings are suitable for heavy slender articles，such as（）.Atimber or steel railsBlocomotives or boilersCrailway passenger coachesDmotor vehicles
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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名词解释题heavy-chain binding protein, Bip (重链结合蛋白)