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【单选题】
下面哪一种是根据酶分子专一性结合的纯化方法( )。A.
离子交换层析
B.
凝胶层析
C.
亲和层析
D.
盐析
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反馈参考答案：
举一反三
【单选题】有关脉管系的组成，正确的是
A.
由心、动脉、毛细血管和静脉组成
B.
由血管和淋巴系组成
C.
由心、动脉、静脉和淋巴管组成
D.
由心血管系统和淋巴系统组成
E.
以上都不正确
【单选题】Once all cylinders are firing regularly, _____ is shut off.
A.
the exhaust valve
B.
the starting air
C.
the inlet valve
D.
the fuel oil
【单选题】听力原文：The beneficiary have to make all the documents complied with the terms and conditions of the credit. (7)
A.
To benefit, all the documents are to be combined with the credit.
B.
All the documents are to be made by the beneficiary for the credit.
C.
All the documents are to be made in conformity with the terms and conditions of the credit.
D.
The beneficiary will make the documents combined with the terms and conditions of the credit.
【单选题】The local government is trying all out to find out who is______the forest fire．
A.
to blame for starting
B.
to blame to start
C.
to be blamed for starting
D.
to be blamed to start
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