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问题
填空题
函数f（x）=2cos
2
x+sin2x的最小值是（）．
答案
参考答案：
补全对话，情景问答
为问题选择合适的回答。
( ) 1. Where is my black pen?
( ) 2. How many books do you have?
( ) 3. What's his name?
( ) 4. Where is the school?
( ) 5. How are you?
A. His name is Li Lin.
B. There it is.
C. Fine, thanks.
D. Look. It's on your desk.
E. Five.
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单项选择题
整体吊弦应竖直安装，顺线路方向允许偏斜不得超过（）。
A.20mm
B.30mm
C.50mm
D.100mm
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