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【单选题】
免疫球蛋白的作用不包括A.
中和外毒素
B.
调理作用
C.
介导ADCC
D.
参与Ⅳ型超敏反应
E.
激活补体经典途径
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反馈参考答案：
举一反三
【多选题】When choosing a general topic, the principles we need to follow include
A.
Choose a topic that has never been studied before.
B.
Choose a topic that we are interested in and know something about.
C.
Choose a proper title.
D.
Choose a topic on which we can find sufficient materials.
E.
Choose a topic which is within our capability.
【多选题】一般常用的化学试剂分为基准试剂、优级纯、分析纯与化学纯四个等级。以下说法正确的是( )
A.
标定滴定液用基准试剂
B.
制备滴定液可采用分析纯或化学纯试剂，但不经标定直接按称重计算浓度者，则应采用基准试剂
C.
制备杂质限度检查用的标准溶液，采用优级纯或分析纯试剂
D.
制备试验或缓冲液等可采用分析纯或化学纯试剂
E.
制备滴定液应采用基准试剂
【简答题】化学试剂按照纯度的可以分为 、 、 、 。
【单选题】There are some principles for us to follow when it comes to starting with a definition in the opening paragraph. Choose the one which is not correct.
A.
We’d better write a clear-cut and concise definition with key points.
B.
We’d better make the definition as extended as possible.
C.
We’d better use our own definition because it is uniquely created.
D.
We’d better write no more than three sentences for a definition.
【简答题】what are the three principles to follow when we are listening for keywords?
【简答题】国际纯粹与应用化合会(IUPAC)将作为标准物质的化学试剂按纯度可以分为_______、_____、_______、________、______。
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