题目内容

People are crowding around the entrance to a toy store, which won’t open for another hour.

A. The store is the only toy store in the entire state.
B. There is always a crowd like this an hour before opining.
C. The store has paid a crowd to show up.
D. The store is having a well-publicized sale.

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Inside a car with an out-of-state license are several maps, suitcases, and bags of snacks.

A. The driver of the car is on vacation.
B. The driver of the car is on a business trip.
C. The driver of the car has children.
D. The driver of the car is on a trip of some kind.

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化学反应焓变的测定实验中为什么把0.200 mol·L－1 CuSO4溶液用移液管准确吸取，而锌粉用台秤称量？

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本实验对所用量热器应有什么要求？是否允许有残留水滴？是否需要用CuSO4溶液润洗？为什么？

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同一截面上各点切应力相互平行。

A. 对
B. 错

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People are crowding around the entrance to a toy store, which won’t open for another hour.

A. The store is the only toy store in the entire state. B. There is always a crowd like this an hour before opining. C. The store has paid a crowd to show up. D. The store is having a well-publicized sale.

Inside a car with an out-of-state license are several maps, suitcases, and bags of snacks.

化学反应焓变的测定实验中为什么把0.200 mol·L－1 CuSO4溶液用移液管准确吸取，而锌粉用台秤称量？

本实验对所用量热器应有什么要求？是否允许有残留水滴？是否需要用CuSO4溶液润洗？为什么？

同一截面上各点切应力相互平行。

A. The store is the only toy store in the entire state.
B. There is always a crowd like this an hour before opining.
C. The store has paid a crowd to show up.
D. The store is having a well-publicized sale.