HTTP协议使用的端口号是()
A、20
B、25
C、69
D、80
E、110
参考答案:D
Maybe you think economics is really tough and you regret choosing it,but it's________for me.[ ]
A. helpful
B. plentiful
C. reasonable
D. enjoyable
人触电后3分钟内开始救治,90%有良好效果。