抗结核药中抗菌谱窄的药物是
A.异烟肼B.对氨基水杨酸C.利福喷丁D.利福平E.乙胺丁醇
参考答案:A
解析:异烟肼对结核杆菌有高度选择性.对其他细菌无作用。
Although he has not gone to college,he shouldn't ________ studying for his degrees.
A.be prevented
B.be stopped
C.be kept from
D.be protected from
用加热的方法使溶液中部分溶剂气化并除去,从而提高溶液的浓度的工艺()
A.蒸发
B.干燥
C.减压干燥
D.常压干燥
E.浸出