秦的货币

The two primary protocols on which the Internet is based are( ).

A．FTP FInd TMAP

B．TCP and IP

C．TCP and SMTP

D．TCP and HTTP

心理咨询的对象主要是哪一种人( )

A．有心理问题的人

B．有心理疾病的

C．有精神疾病的人

D．以上三者都不是

He _______ busy yesterday, or he _______ you with your experiment.

A．was; had helped

B．was; would have helped

C．had been; would have helped

D．were; would have helped

移动变电站接地系统接地电阻不大于1Ω，主接地极和辅助接地极距离不小于5米。（）

现代汉语的音节结构中不可缺少的成分是（）。

A、辅音

B、韵尾

C、声调

D、韵腹