在潮湿的容器内作业的安全电压是（）。
A、12伏
B、24伏
C、36伏
D、48伏
参考答案：A
—Would you rather come on Friday or Saturday?
— _____.
A．Yes, of course
B．The other is better
C．What’s the matter
D．Either would suit me
高原服习
