将pH为8的NaOH溶液与pH为10的NaOH溶液等体积混合后，溶液中的氢离子浓度最接近于[ ]

A．1/2(10^-8+10^-10) mol/L

B．(10^-8+10^-10)mol/L

C．1/2(10^-6 +10^-4)mol/L

D．2×10^-10mol/L

应给出杀虫剂限度试验结果。

A．Limit test for heavy metals and foreign organic and mineral matters should be given．
B．Limit test for contaminants should be provided, such as heavy metals, foreign organic matters and mineral matters．
C．Limit test for arsenic and lead should be given．
D．Limit test for pesticides may be needed．
E．Limit test for stemand rachis fragments in the leaves and leaflets,should be given．
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