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【简答题】
已知y=f（x）是以π为周期的奇函数，且x∈[- π 2 ，0]时，f（x）sin2x，则f（ 13π 6 ）=______．
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举一反三
【简答题】请写出两个你熟悉的无理数：______．
【简答题】请写出你自己下肢的两个关节：______关节，______关节．
【简答题】请写出一个你熟悉的负无理数：________________
【多选题】关于连词的用法,下面句子中存在错误的有
A.
Because K is very active in air, so that it is possible to autoignite.
B.
The widely-investigated metal species for the catalytic growth of carbon nanotubes include Fe, Co, Ni.
C.
The specific surface area of the material is up to 3000 m2/g, the pore volume is as high as 2 cm3/g.
D.
The conventional synthesis requires tedious multistep procedures and prolonged synthetic time, and the resulting bimetallics usually disperse unevenly and show poor stability.
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