在三相交流电路中，各电阻元件上消耗的功率之和称为（）。A、视在功率 B、无功功率 C

There will be more than two hundred artists to attend the meeting to be held tomorrow.

A                       B           C                D

以下哪项不是颈脉怒张的病因( )

A．肝阳上亢

B．水气凌心

C．肺气壅滞

D．心肾阳衰

E．心血瘀阻

_____ when the light went on last night?

A．What were you doing

B．What have you done

C．What did you do

D．How were you doing

在BJ系列手抬泵中，四冲程汽油机和较小功率的二冲程汽油机一般使用（）。

A.水里

B.机器

C.风冷

D.电冷

公司股东以其出资额对公司债务承担有限责任，公司以其注册资本对公司的债务承担责任。 ( )