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【单选题】
连续培养可以通过()来实现。A.
光度计检测培养液内的浊度变化来控制加入/移走液体的速率
B.
不停高速加入新鲜培养基
C.
持续匀速移走已由培养物
D.
间歇性的变化培养温度
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反馈参考答案：
举一反三
【单选题】— Did you call on any of your old friends when you returned to your hometown ? —______ of them . They were all very busy .
A.
Nobody
B.
None
C.
Both
D.
Neither
【单选题】---When _______ your computer ___________? ---Yesterday afternoon.
A.
did ; repair
B.
did ; repaired
C.
was ;repaired
D.
has ;repaired
【单选题】－When did you get your first pair of skates? －_______.
A.
For 6 years
B.
Since I was 6 years old.
C.
When I was 6 years old.
D.
Since 6 years ago.
【单选题】When did your father ___________ your mother?
A.
get married
B.
marry with
C.
marry
D.
marry to
【简答题】执行（）命令操作，元器件按左端对齐。
【单选题】学测6 When did your father __________ the Army?
A.
join
B.
join in
C.
take part in
D.
attend
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