电路如本题图所示，设二极管的正向压降U0=0.6V，则，ID=（）。
A．0.775mA
B．1.31mA
C．0.55mA
D．1mA
参考答案：B
There _____ a number of people in the bath room. The number of them _____ almost fifty. [ ]
A. are; is
B. is; is
C. is; are
D. are; are
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