问题
单项选择题
交流电源中心的作用是将电车的（）后，为车辆交流负载供电。
A、线网电源变换为24V
B、动力直流电源变换为三相交流电源
C、线网电源变换为交流电源
D、动力直流电源变换为24V
答案
参考答案：B
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交流电源中心的作用是将电车的（）后，为车辆交流负载供电。
A、线网电源变换为24V
B、动力直流电源变换为三相交流电源
C、线网电源变换为交流电源
D、动力直流电源变换为24V
参考答案：B
| 综合填空。 | |
eyes, a big nose and a small mouth. He has a sister. Her name is Julia. She is ten. She is a __3__, too. She has a small nose , but her mouth is __4__. Adam and Julia are in the same school, __5__ they are in different grades. They have a nice house (房子). Look! They are in the house. |