应用胸外心脏挤压法进行触电急救时,对成人应以每分钟挤压()次为宜。
A、50
B、60
C、80
D、100
参考答案:C
Please tell ___________ about it if ___________ doesn't know. [ ]
A. her, she
B. hers, her
C. herself, her
D. she, she
串联电路中()处处相等。
A、电流
B、电压
C、电容
D、电功率