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【判断题】
电流强度是在电场作用下，单位时间内通过导体截面的电量。
A.
正确
B.
错误
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【单选题】Go along the street, turn to the left at the end of the street and _____ you’ll find the post office.
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A.
正确
B.
错误
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【单选题】Sound personal health choice is often difficult to make because____.
A.
current medical knowledge is still insufficient
B.
there are many factors influencing our decisions
C.
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【简答题】已知函数f（x）是在（0，+∞）上每一点处可导的函数，若xf′（x）＞f（x）在（0，+∞）上恒成立． （Ⅰ）求证：函数g（x）= f(x) x 在（0，+∞）上单调递增； （Ⅱ）当x 1 ＞0，x 2 ＞0时，证明：f（x 1 ）+f（x 2 ）＜f（x 1 +x 2 ）； （Ⅲ）已知不等式ln（1+x）＜x在x＞-1且x≠0时恒成立，证明： 1 2 2 ln2 2 + 1 3 2 ln3 2 ...
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【简答题】When high school started, Becky and I became best friends. We 36 many interests and quickly became inseparable. When high school ended, we both cried 37 we would attend different colleges. Our first t...
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【单选题】Sound personal health choice is often difficult to make because____.
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