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问题
单项选择题
体育舞蹈场地为()平方米
A.23×15
B.23×16
C.26×15
D.23×26
答案
参考答案:A
选择题
Wind power is an ancient source of energy _____ we may return in the near future.
A. on which
B. by which
C. to which
D. from which
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判断题
掘进工作面回风巷道的风流中瓦斯浓度达到2%时,必须停止工作,撤出人员。()
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