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【简答题】
在同一平面内的任意个力偶可合成为一个合力偶,合力偶的力偶矩等于所有力偶的力偶矩的 ___ 和。
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举一反三
【单选题】She ________ geography in a university when I met her, but I have not seen her even since.
A.
had studied
B.
studied
C.
had studied
D.
was studying
【单选题】She had not seen her father all ________, because he mostly worked on the ships.
A.
too much
B.
very much
C.
that much
D.
so much
【单选题】She had not seen her father all _________, because he most worked on the ships.
A.
too much
B.
very much
C.
that much
D.
so much
【简答题】已知函数 f(x)=sin x 2 cos x 2 + 1 2 sin(x+ π 2 ) ． （1）写出f（x）的最小正周期以及单调区间； （2）若函数 h(x)=cos(x+ 5π 4 ) ，求函数y=log 2 （f（x）?h（x））的最大值，以及使其取得最大值的x的集合．
【简答题】Mary could not resist the temptation to whisper about what she had seen in her friend's ear.
【简答题】已知向量 a =(cosωx-sinωx，sinωx) ， b =(-cosωx-sinωx，2 3 cosωx) ，其中ω＞0，且函数 f(x)= a ? b +λ （λ为常数）的最小正周期为π． （Ⅰ）求函数y=f（x）的图象的对称轴； （Ⅱ）若函数y=f（x）的图象经过点 ( π 4 ，0) ，求函数y=f（x）在区间 [0， 5π 12 ] 上的取值范围．
【简答题】The washwoman was very old, as could be seen from the wrinkles in her face and the way she had to struggle to carry her big bundle of laundry. But 1 her aging body, her spirit was still strong. Year a...
【简答题】求函数y=-cos 2 x+ 3 cosx + 5 4 的最大值及最小值，并写出x取何值时函数有最大值和最小值．
【简答题】I had never seen her wearing colourful clothes. In fact, she really did not know how to ________________.
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