题目内容

The student isn't ______.

A. doing his homework
B. do his homework
C. does his homework

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These cooks are _______ in the kichen.

A. cook a meal
B. cooking a meal
C. cook

The aeroplane is ______ the river.

A. flying on
B. flying
C. flying over

归一化法的优点不包括( )。

A. 简便、准确、不需要标准物
B. 不必准确称量
C. 操作条件稍有变化对结果影响较小
D. 不需要校正因子

归一化法的缺点是( )。

A. 简便、准确、不需要标准物
B. 操作条件稍有变化对结果影响较小
C. 不必准确称量
D. 所有组分都出峰,并测定所有组分的A和fi′