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【单选题】
下面哪一个叙述是不正确的A.
抗生素是来源于细菌、真菌或其他微生物通过发酵产生的二次代谢产物
B.
抗生素在很低的浓度下能抑制或杀灭各种病原菌，达到治疗的目的
C.
早期抗生素主要用于治疗细菌或真菌感染性疾病，故称为抗菌素
D.
磺胺类药物百浪多息，是最早上市的抗生素
E.
结构简单的抗生素可以用合成法制得，如氯霉素
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【简答题】According to Howard Silverblatt， if companies are sure of the economic recovery， they willuse their reserved money on capital expenditures as well as dividends and stock buybacks. 查看材料
【单选题】What can we infer from the passage?
A.
The state should provide protection for all the old people.
B.
The state has to create a suitable framework to restrict the private pensions.
C.
The state should protect those who can't support themselves.
D.
The state will play a secondary role in pensions due to more private pensions.
【单选题】Before we move, we should ________ some of the old furniture, so that we can have more room in the new house.
A.
cancel
B.
conceal
C.
discard
D.
dissipate
【简答题】检查发电机转子滑环时,滑环的光洁度要 ,滑环的绝缘性应 。
【单选题】The saying “Old friends and old wine are best” means the things and people ____ we know are better than the unfamiliar.
A.
what
B.
which
C.
that
D.
who
【单选题】磷霉素作用特点不包括以下哪项( )
A.
广谱抗生素
B.
抑制细菌细胞壁的早期合成
C.
对耐甲氧西林金黄色葡萄球菌有效
D.
与其他抗生素之间存在交叉耐药
E.
可透过胎盘屏障
【简答题】水环境的监测要从 、 及生活污水三个方面进行。
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