一个化妆品样品同时做多种分析时,应先检测()。
A.细菌总数
B.铅
C.汞
D.砷
E.皮肤刺激试验
参考答案:A
I still remember the days __________ we spent together at JingGang Mountain ______ is the famous place of interest.
A.when; where
B.when; which
C.which; which
D.which; where
船舶对水航程SL,对地航程SG,船速VE,航时t,若SL>VEt,且SL>SG,则船舶航行在()情况下。
A.顺风顺流
B.顶风顶流
C.顺风顶流
D.顶风顺流