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问题
问答题 简答题
同位素配制箱乳胶手套为什么要定期更换？
答案
参考答案：
预防因手套老化造成人员污染、辐射。
选择题
— Have you moved into the new house?
— Not yet, the rooms _____.
A. are being painting
B. are painting
C. are painted
D. are being painted
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单项选择题
切削液的作用是冷却（）防锈和清洗。
A.提高刀具寿命
B.减少摩擦
C.润滑
D.降温
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