问题
单项选择题
为了保证频率合格，水轮发电机因转速慢，故转子极对数比汽轮发电机极对数（）。
A.少；
B.多；
C.相等；
D.不一定。
答案
参考答案：B
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为了保证频率合格，水轮发电机因转速慢，故转子极对数比汽轮发电机极对数（）。
A.少；
B.多；
C.相等；
D.不一定。
参考答案：B
American school life is different from (和……不同) Chinese. American students usually get to school at around 8:30 in the morning. They put their school bags in their lockers (柜子) and only take one book, one notebook and one pen to each class. In class, American students can sit in their seats (座位) when (当……时候) they answer their teachers questions At around 12:00 students have lunch. American students don’t go home for lunch. They have it at school. Most students like pizza(比萨), hot dogs or hamburgers. At 1:00 in the afternoon, they start to have classes. Their classes are usually over(结束) at three o’clock. Then they join in the activities （活动）of clubs or sports.
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