乙酰化滤纸层析荧光光度法测定苯并[A]芘的最低检出浓度为0.04ug/L.

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答案

参考答案：错

解析：乙酰化滤纸层析荧光光测定苯并[A]芘最低检出浓度为0.004ug/L.

选择题

“He hasn’t got any hobbies— ________ you call playing games on computer a hobby.” Mr.Lin said.

A．If

B．Unless

C．When

D．Since

选择题

— "How long do you suppose it is _______ he left for Japan?"

— "No more than half a month."[ ]

A.when

B. before

C. after

D. since