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【简答题】求函数f（x）= sin 2 x+cos 2 x+ sin2x， （1）求f（x）的周期与值域； （2）求f（x）在[0，π]上的单调递减区间。
【简答题】Studies show that children who eat breakfast do better in school. It doesn’t take much further thought to know that s will feel better and do better at work as well. Whether you work at home, on ...
【单选题】Thinner isn t always better. A number of studies have【C1】______that normal-weight people are in fact at higher risk of some diseases compared to those who are overweight. And there are health conditio...
A.
denied
B.
concluded
C.
doubted
D.
ensured
【单选题】Jim studies better than Tom, but Tom is____________ and he has more friends.
A.
friendly
B.
more friendly
C.
most friendly
【简答题】Thinner isn’t always better. A number of studies have __1___ that normal-weight people are in fact at higher risk of some diseases compared to those who are overweight. And there are health conditions...
【单选题】小明做分析实验时,称了 0.0204g 的苯甲酸样品,准备用紫外可见分光光度计测定其含量。按照分析方法的原理来分,本次分析属于
A.
常量分析
B.
半微量分析
C.
化学分析
D.
仪器分析
【单选题】小明做分析实验时,称了 0.0204g 的苯甲酸样品,准备用紫外可见分光光度计测定其含量。按照试样的用量来分,本次分析属于
A.
常量分析
B.
半微量分析
C.
化学分析
D.
仪器分析
【简答题】已知函数f(x)= sin2x-2sin 2 x， (1)若点P(1，- )在角α的终边上，求f(α)的值； (2)若x∈ ，求f(x)的值域．
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