修复旧巷时，只有在瓦斯深度不超过（）才能作业。
A、1％
B、1.5％巷道宽度
C、2％
参考答案：A
It took her many years to from the fact her son died.
A．get over, which
B．get away, that
C．get out of, that
D．get away, which
养基的pH过高可扩大下列哪种药物的抑菌圈（）。
A.四环素
B.阿米卡星
C.红霉素
D.左氧氟沙星
E.青霉素
