葛根中主要成分是
A.295~300nmB.217~220nmC.1700~1800cmˉ1D.420nmE.低40cmˉ1
参考答案:C
交接班时,不属于交接班人员共同检查内容的是()。
A、胶带的阻燃性能
B、清理范围的文明生产
C、设备运行状况
D、以上均不正确
Mobile phone users have developed a series of symbols, such as ^_^ and └(^o^)┘, to show they feel.
A.which
B.why
C.how
D.what