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9. Rome was not built in ____ day.

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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

钻孔灌注桩，桩长15m,设计桩外径为0.6m,桩数为60根,则钻孔灌注桩工程量为( )。

A. 259.427 m3
B. 254.340m3
C. 262.818m3
D. 271.296m3