不能同一人进行以下哪一项操作()
A.填制凭证与主管签字
B.填制凭证与出纳签字
C.主管签字与审核凭证
D.审核凭证与出纳签字
参考答案:A
— Would you mind watering the flowers for me?
— _____. I have to go to the post office. [ ]
A. Not at all
B. Never mind
C. No, please
D. Sorry, I can't
现在人们已能合成自然界并不存在的许多性能优良的有机高分子材料。由氯乙烯制取聚氯乙烯的反应属于_________反应。适合于合成聚氯乙烯的原料是_________
A CH4,Cl2 B CH3CH3,HCl C CH≡CH,HCl D CH2=CH2,HCl