The rest of the books_____ (be)locked in the box.
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On the floor _____ (be) piled some old books.
Many _____ (be) for going by plane.
Phonetics ____ (be)a required subject in our department.
密度为1000 kg.m-3 的清水,在圆形导管(57×3.5mm )内以3600 kg.h-1的流量流动,它的体积流量与流速分别为( )
A. 0.001 m3.s-1和 0.51 m.s-1
B. 0.01 m3.s-1和 0.051 m.s-1
C. 0.1 m3.s-1和 0.051 m.s-1
D. 0.001 m3.s-1和 0.0051 m.s-1