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【简答题】
设函数f（x）的定义域为R，若存在与x无关的正常数M，使|f（x）|≤M|x|对一切实数x均成立，则称f（x）为有界．在函数①f（x）=-5x，②f（x）=sin 2 x，③ f(x)=( 1 2 ) x ，④f（x）=xcosx中，属于有界的有______（填上所有正确的序号）．
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反馈参考答案：
举一反三
【单选题】听力原文：M: I'm so tired that I can't see straight. W: You've been tired a lot lately, haven't you? M: Well, for the last few weeks, I've had to stay up most the nights to observe star configurations for ...
A.
Find his glasses.
B.
Sit up straight.
C.
Get enough rest.
D.
Change his tires.
【单选题】--- Hi, Grandma, why do you look so tired? --- I’m tired. I _______ the cleaning all morning.
A.
did
B.
had done
C.
have been doing
D.
have done
【单选题】听力原文：M: What trouble are you having with your eyes? W: Well, I'm a bit tired and you know I do a lot of reading because of my work and besides our room is in the basement in the Department of English ...
A.
She has a lot of reading assignment.
B.
Her room is not well lit.
C.
The English Department is in a basement.
D.
She lives in a basement and works hard.
【单选题】--------You seem to show interest in cooking. -------------_________? On the contrary, I’m tired of it.
A.
Really
B.
Pardon
C.
OK
D.
What
【单选题】电气化铁路线路拨道，线路中心位移不得超过（ ）mm；一侧拨道量年度累计不得大于120mm，并不得侵入限界。
A.
± 15
B.
± 30
C.
± 45
D.
± 70
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