问题
多项选择题
目前工程上所采用的基本换流单元有（）脉动换流单元和（）脉动换流单元两种。
A.6
B.8
C.12
D.16
答案
参考答案：A, C
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目前工程上所采用的基本换流单元有（）脉动换流单元和（）脉动换流单元两种。
A.6
B.8
C.12
D.16
参考答案：A, C
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| Dear Annie, Thank you for your letter, I'm glad you like your school. I go to school from Monday to Friday. We have four l in the morning and two in the afternoon. We have 2 to do after class. 3 Monday and Wednesday afternoon we 4 sports. On Tuesday afternoon 5 0f us have _ 6 _ singing class, and on Thursday aftemoon some have a 7 class. On Friday afternoon we practise 8__ English. My Chinese friends would like 9 with me in English. They think I am like an English teacher. Isn't it great? On Sundays and Saturdays I don't go to school. Very often I go to the parks and have a good time 10 my family there. | |||
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