发电机出口额定电压为15750V。

The experiment shows that proper amounts of exercise, if____regularly,can improve our health.    [ ]

A. being carried out    

B. carrying out    

C. carried out    

D. to carry out

纽约世界贸易小心的设计者是()

A．菲利普约翰逊

B．山崎实

C．西萨佩里

D．SOM

生长或开花的兰花块茎

下列代谢过程不能直接补充血糖的是（）

A.肝糖原分解

B.肌糖原分解

C.食物糖类的消化吸收

D.糖异生作用

E.肾小球的重吸收作用

The meeting was ______ over by the mayor of the city.

A. presumed
B. proposed

C. presented
D. presided