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【判断题】
开口系不可能是绝热系A.
正确
B.
错误
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【单选题】There are some children _____ kites in the park. Let's go there. [ ]
A.
to fly
B.
flying
C.
are flying
D.
fly
【简答题】阅读理解。 Some children are flying kites near the river. They are very high and Peter can see them in the classroom. His mother's friend,Mrs. White comes to see his mother this morning and brings a kite t...
【简答题】图 4 所示为某放大电路及三极管输出特性曲线。其中 V CC =12V , R C =5k W , R B =560k W , R L =5k W ,三极管 U BE =0.7V 。 ( 1 ) 用图解法确定静态工作点 并 判断三极管所处的状态。 ( 2 ) 画出交流负载线。 ( 3 ) 确定最大输出电压幅值 U om 。
【简答题】阅读理解。 Some children are flying kites near the river. They are very high and Peter can see them in the classroom. His mother's friend Mrs White comes to see his mother this morning and brings a kite to...
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