问题
多项选择题
绞车上行时必须挂（）。
A.车尾巴
B.阻车器
C.保险绳
答案
参考答案：A, C
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绞车上行时必须挂（）。
A.车尾巴
B.阻车器
C.保险绳
参考答案：A, C
| 用方框里所给词的适当形式填空。 | |
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