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问题
填空题
脚手架垫板材质为木质或槽钢，长度不少于两跨，木质垫板厚度不小于（）mm
答案
参考答案：
50mm
选择题
_____ to train his daughter in English，he put an ad like this in the paper "_____，an English teacher for a ten-year-old girl".
A. Determined; Wanted
B. Determined; Wanting
C. Determine; Wanted
D. Determining; Wanting
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问答题 简答题
试述SW6-110、220型断路器的检修周期。
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