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【简答题】
试证明： 设F∈R([a，b])，g∈R([a，b])， 且 .若f(x)=g(x)(x∈E)，则 .
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举一反三
【单选题】------I have just had my watch repaired. ------How much did they ____ for that?
A.
cost
B.
charge
C.
spend
D.
pay
【单选题】--- Oh, it’s you! I ___________ you. ---- I have just had my hair cut, and I am wearing new glasses.
A.
didn’t recognize
B.
don’t recognize
C.
haven’t recognized
D.
hadn’t recognized
【简答题】一般对于无水的松散地层,小导管注浆材料宜采用()水泥浆。
【单选题】关于广播电视中心工艺系统中线缆的布放，为防止电磁噪声干扰，下列线缆布放正确的是( )。
A.
应将音视频信号线和电源线分别放在两侧，控制线居中布放;
B.
应将音视频信号线和控制线分别放在两侧，电源线居中布放;
C.
应将音视频控制线和电源线分别放在两侧，信号线居中布放;
D.
可以将音视频控制线、电源线和信号线随机布放;
【单选题】—I have just had my watch repaired. —How much did they ________ for that? [ ]
A.
cost
B.
charge
C.
spend
D.
consider
【单选题】— I have just had my watch repaired. —How much did they ______ you?
A.
pay
B.
charge
C.
cost
D.
spend
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