图示电路中,R=1kΩ,C=1μF,ui=1V,电容无初始储能,如果开关S在t=0时闭合,则输出电压波形正确的是()。
A.A
B.B
C.C
D.D
参考答案:C
解析:
Children often quarrel and even fight with each other, but it won't be long before they _______and play together.
A.turn up
B.show up
C.take up
D.make up
辨别寒热真假时,真象常反映在()
A.皮肤
B.四肢
C.舌、脉
D.面色
E.以上均非