题目内容

In the past ten years Jack has been with us. I think he has proved that he ______ respect

A. qualifies
B. expects
C. reserves
D. deserves

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_______ formal occasions, you should talk about some world issues or social problems, not

A. In
B. At
C. On
D. By

为防止电焊弧光伤害睛,应采取的防护方式是使用()

A. 墨镜
B. 滤光镜
C. 平光镜
D. 风镜

瓶冒一般不能用()材料制作。

A. 钢管
B. 可锻铸铁
C. 球墨铸铁
D. 普通塑料

装卸乙炔瓶和石油气瓶时应该轻拿轻放,()剧烈振动

A. 视情况可
B. 可以
C. 不得
D. 随便

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