采掘工作面风流中，瓦斯浓度（）时，必须停止电钻打眼。
A.达到1％
B.超过1％
C.达到1.5％
D.超过1.5％
参考答案：A
Because of the terrible earthquake, some people became homeless and they had to ________the tents for the night.
A．put away
B．put up
C．put off
D．put down
婴儿消化系统解剖生理特征是()
A.肾负荷小
B.基础代谢旺盛、生长迅速
C.胰脂酶发育好
D.蛋白酶、胃脂酶发育好
E.胰淀粉酶发育好
