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【单选题】
关于穿梭质粒载体,下面哪一种说法最正确?A.
在不同的宿主中具有不同的复制机制
B.
在不同的宿主细胞中使用不同的复制起始点
C.
在不同的宿主细胞中使用不同的复制酶
D.
在不同的宿主细胞中具有不同的复制速率
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反馈参考答案：
举一反三
【单选题】Which of the following statements is NOT TRUE?
A.
Louis was famous for his discovery.
B.
Though his left arm and leg were disabled(残疾的), he worked even harder than before.
C.
In his childhood he made up his mind to become a doctor.
D.
His disabled left arm and leg had nothing to do with the mad dogs.
【单选题】If you had _____ your test paper carefully before handing it in, you would have made fewer mistakes.
A.
lookedup
B.
thoughtabout
C.
goneover
D.
goneround
【判断题】发动机异响故障会出现发动机正常运转时所没有的响声,同时会出现发动机振抖、运转不稳定、功率下降、燃润料消耗增加、运转无力、排气管排烟颜色异常等现象。
A.
正确
B.
错误
【单选题】It is very ______ of you to take care of the children while their parents are away.
A.
thoughtful
B.
thankful
C.
thoughtbess
D.
thoughtfulness
【单选题】发动机异响故障会出现发动机正常运转时所没有的响声,同时会出现发动机振抖、( B )、排气管排烟颜色异常等现象。
A.
运转不稳定、功率下降、燃润料消耗增加
B.
运转不稳定、功率下降、燃润料消耗增加、运转无力
C.
功率下降、燃润料消耗增加、运转无力
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