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【单选题】
如果 是第二象限角,那么tan 的值是( )A.
负数
B.
正数
C.
可正可负
D.
非负数
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反馈参考答案：
举一反三
【简答题】在数字电路中,二进制数转换成十进制数的方法是( )
【简答题】云南饮食民俗的丰富性表现在哪些方面?
【单选题】---- Your sister isn’t a nurse, is she? ----- ________. She teaches English in a middle school.
A.
No, she isn’t
B.
yes, she is
C.
Yes, she isn’t
【单选题】二进制数转换成十进制的方法是?
A.
将二进制数按权展开求和
B.
第n位的数（0或1）乘以2的n次方
C.
将二进制数按权展开相乘
D.
第n位的数（0或1）乘以2的n-1次方
【简答题】句型转换。 1. He studies at No.1 Middle School. (改为否定句) He _________ _________ at No.1 Middle School. 2. He plays basketball very well. (改为同义句) He is _________ _________ playing basketball. 3. My brother...
【简答题】阅读理解。 Lily is American. She is twelve. She is a middle school student. She is in No.15 Middle School. She is in Class Four, Grade One. Her teacher is Mrs Green. Her bedroom is very nice. In her bedroo...
【简答题】Alice was a beautiful girl. She liked nothing except dressing __1__ and dancing when she was at school. Of course she wasn’t good at her __2__. But the boys were ready to help her with her lessons __3...
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