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单项选择题

当三相四线制电源的线电压为380 v时，额定电压为220v的负载必须接成[填空(1)]形。

A．A、星形
B．B、三角形
C．C、星形/三角形
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多项选择题
桂花生态习性有( )。
A．喜温和环境
B．喜阳光
C．喜湿润
D．喜偏酸性砂质土壤
单项选择题
Airsickness may occur during the flight, especially if the person is passive, in a hot ( ) cabin and is experiencing unusual motion, such as in turbulence. A.
stuffy B.
crowded C.
noisy D.
quiet
问答题
and making phone calls for 3____________ business in that country.
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