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【多选题】
滴定法测定阿司匹林片剂含量的好处是( )。A.
消除空气中氧气的干扰
B.
消除枸橼酸(或酒石酸)的干扰
C.
消除水杨酸和醋酸的干扰
D.
可防止阿司匹林水解
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反馈参考答案：
举一反三
【单选题】It can be inferred from the passage that the family background of Mr. Moritz
A.
gave him the motive to study hard to be successful.
B.
showed how scholarship changed his family members' life.
C.
illustrated that his family emphasized on education very much.
D.
proved that immigration family can also make great achievements.
【判断题】The general statements are usually the first sentences that provide background information on the topic.
A.
正确
B.
错误
【判断题】The general statements are the first sentences that provide background information on the topic.
A.
正确
B.
错误
【简答题】that the background noise stimulated (14) ________ ________ disturbed him.”
【单选题】We can assume that the background of this text was probably______ in the U.S..
A.
in the 1950s
B.
in the 190s
C.
in the 1970s
D.
in the 1980s
【单选题】Choose the correct words or phrases to complete the sentences. Even when there was a lot of noise, he could pick up a pen and paper, and engross himself in a problem so much that the background noise ...
A.
rather than
B.
so as not to
C.
instead of
D.
no more than
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