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问题
单项选择题
对绿脓杆菌有特殊抑菌力的抑菌剂是
A．三氯叔丁醇
B．苯氧乙醇
C．洗必泰
D．苯扎溴铵
E．硝酸苯汞
答案
参考答案：
B
选择题
Maria asked Jim, "Are you working hard at geography now?"
Maria asked Jim ______ he ______ working hard at geography then.
A. if, was
B. that, was
C. /, is
D. whether, is
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填空题
抽油机一级保养，（）进行一次。
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