水谷之海是指
A．脾
B．胃
C．大肠
D．小肠
E．六腑
参考答案：B
Jenny was born ______________. [ ]
A. on July 10, 1990
B. in July 10, 1990
C. in 1990, July 10
D. on 1990, July 10
A．副线圈输出交流电的频率为10Hz
B．交流电压表的示数为20V
C．电阻R上消耗的电功率为2kW
D．原线圈中电流的最大值为100A
V