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【简答题】
已知函数f（x）=cos 4 x-2sinxcosx-sin 4 x。 （1）求f（x）的最周期； （2）求f（x）的最大值、最小值。
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反馈参考答案：
举一反三
【单选题】Though Japan is now an economic giant, it has one vital weakness, that is, it lacks the ()material necessary for its industry.
A.
primitive
B.
raw
C.
crude
D.
primary
【单选题】One weakness of this study may be ______ .
A.
It overestimates the level of sociability in the diarists' lives.
B.
It underestimates the level of sociability in the diarists' lives.
C.
It misinterprets the level of sociability in the diarists' lives.
D.
It underrates the level of sociability in the diarists' lives.
【单选题】One weakness of this study may be ______.
A.
it overestimates the level of sociability in the diarists' lives
B.
it underestimates the level of sociability in the diarists' lives
C.
it misinterprets the level of sociability in the diarists' lives
D.
it underrates the level of sociability in the diarists' lives
【单选题】Although Japan is now an economic giant, it has one vital weakness that it lacks the ______ material necessary for its industry.
A.
original
B.
primary
C.
crude
D.
raw
【简答题】重金属检查时：难溶于稀酸，但能溶于碱性水溶液的药物采用()A.硫代乙酰胺法 B.第二法 C.硫化钠法 D.微孔滤膜法 E.第五法 在实验条件下，供试液澄清无色，对检查无干扰的药物采用()A.硫代乙酰胺法 B.第二法 C.硫化钠法 D.微孔滤膜法 E.第五法 仅含有2?5μg重金属杂质的药物采用()A.硫代乙酰胺法 B.第二法 C.硫化钠法 D.微孔滤膜法 E.第五法 难溶于水或稀醇的有机药物应采用...
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