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【简答题】
为测定大理石含CaCO 3 的质量分数，取大理石12．5g，加入100g稀盐酸的烧杯中，两者恰好完全反应（假设其他杂质不与盐酸反应，也不溶解），将反应后所得气体通入到足量的澄清的石灰水中，得到沉淀10g。试计算大理石样品中CaCO 3 的质量分数。
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【简答题】积分电路的条件是τ＝RC（）tk，当输入为矩形脉冲时，输出为近似线性上升和下降的（）波。
【单选题】— ______________________ — I'm going to the zoo. [ ]
A.
Where are you going?
B.
When are you going?
C.
What are you going to do?
【单选题】Where _____ this summer holiday? [ ]
A.
are you going
B.
do you going
C.
will you going
D.
does you go
【单选题】— ______________ — I'm going to the park. [ ]
A.
Where are you going?
B.
When are you going?
C.
What are you going to do?
【简答题】Are you going to repair the car yourself, or are you going to have it (repair) ______?
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【单选题】—________? —We are going to Los Angeles. [ ]
A.
Where are you going to tomorrow
B.
Where are you going tomorrow
C.
Where did you go
D.
Where do you go to
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