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【单选题】
以下物质能作为基准物质的是:A.
NaOH
B.
KMnO4
C.
浓硫酸
D.
99.99% 纯铁丝
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举一反三
【单选题】---You have no idea what _____ great fun it was yesterday in Disneyland. ---Yeah, I wish I could have such _____ fun day.
A.
不填; 不填
B.
the; a
C.
不填; a
D.
a; a
【简答题】I have something of great importance to d______ with you.
【单选题】I was supposed to _______ all my shopping by now, but I still have a great many to buy.
A.
to have finished
B.
to finish
C.
to be finishing
D.
to have been finished
【简答题】I have had great deal of trouble _____ the rest of the class. (A) coming up against (B) up for (C) keeping up with (D) living up to
【简答题】I have had great deal of trouble _____ the rest of the class. (A) coming up against (B) up for (C) keeping up with (D) living up to
【简答题】自然界中甜度最大的单糖是(),存在于水果和()中,结构简式为()
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