职业纪律是企业的行为规范，职业纪律具有随意性的特点
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________(fail)severaltimes,theyneedsomeencouragement.
Whenhesuddenly________upthesubjectofgeneticengineering,therewasanembarrassedsilence.
Iwishyou________likethat.
设y=y(x)是由方程所确定的隐函数，则 .=
设函数y=sinx^2+2x，求dy.