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【简答题】
Cu与Zn的合金称为黄铜，有优良的导热性和耐腐蚀性，某化学兴趣小组的同学为了测定某黄铜的组成取10g该黄铜样品于烧杯中，向其中5次加入相同溶质质量分数的稀H 2 SO 4 ，使之充分反应，见下表： 加入稀酸硫/g 充分反应后剩余固体质量/g 第1次 10 M 第2次 10 7．4 第3次 10 6．1 第4次 10 5．6 第5次 10 5．6 试回答下列问题： （1）从以上数据可知，最后剩余的5．6克固体的成分是________________，m＝________________。 （2）黄铜样品中锌的质量分数。 （3）计算所用稀硫酸中硫酸的质量分数。
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【单选题】听力原文：W: Daniel, shouldn't we have our computer training done earlier? We will be busy with meetings and events soon. M: It's planned for late January, but we can reschedule it since we can finish the ...
A.
November.
B.
December.
C.
January of next year.
D.
The training is cancelled.
【单选题】—Our team _______ the match. We've got the first place. —Well done! Congratulations! [ ]
A.
hit
B.
beat
C.
won
D.
watched
【单选题】Now that we’ve discussed our problem, are people happy with the decisions _______?
A.
taking
B.
take
C.
takenD .to take
【简答题】1-1-15 COD的汉语意思是( )
【单选题】Now that we've discussed our problem, are people happy with the decisions ________ ? [ ]
A.
taking
B.
take
C.
taken
D.
to take
【简答题】We’ve done a lot of work and we ______ a break. A) are worth B) are worthy of C) are valuable of D) deserve
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