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8. We need to buy _____ tourist handbook before going traveling.

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9. Rome was not built in ____ day.

10. He worked as _____ language teacher in that university.

11. The speed of this car was 160 miles ____ hour.

三个阻值相同的电阻R，两个并联后再与另一个串联，其总电阻等于（）。

A. R
B. 0.25R
C. 0.5R
D. 1.5R