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Erect the the movable hoist before you lift the gearbox.

A在提升齿轮箱之前,先安装移动式起重机;

B先向上提起齿轮箱,再把可移动的钩子挂好;

C在提升齿轮箱之前,先把可移动的钩子挂好;

正确答案:A (备注:此答案有误)

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