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【多选题】在使用梯子过程中，以下行为正确的是（ ）
A.
梯子上只允许一个人工作（二人梯除外），下方应有人扶着梯子。
B.
禁止两人以上同时攀爬同一竖直爬梯
C.
使用不高于1.5M的人字梯时，可坐在梯子顶端作业
D.
梯子的顶部应该超过作业高度1 米。
【单选题】My father was a foreman of a sugar-cane plantation in Rio Piedras, Puerto Rico. My first job was to drive the oxen that ploughed the cane fields. I would walk behind an ox, guiding him with a broomsti...
A.
he should work for those who he liked most
B.
he should work longer than what he was expected
C.
he should never fail to say hello to his owner
D.
he should be respectful and faithful to the people he worked for
相关题目：
【多选题】在使用梯子过程中，以下行为正确的是（ ）
A.
梯子上只允许一个人工作（二人梯除外），下方应有人扶着梯子。
B.
禁止两人以上同时攀爬同一竖直爬梯
C.
使用不高于1.5M的人字梯时，可坐在梯子顶端作业
D.
梯子的顶部应该超过作业高度1 米。
【单选题】My father was a foreman of a sugar-cane plantation in Rio Piedras, Puerto Rico. My first job was to drive the oxen that ploughed the cane fields. I would walk behind an ox, guiding him with a broomsti...
A.
he should work for those who he liked most
B.
he should work longer than what he was expected
C.
he should never fail to say hello to his owner
D.
he should be respectful and faithful to the people he worked for
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