他推行郡县制,统一了货币、度量衡和文字等,巩固了国家的统一。此人是()
A.齐桓公
B.秦始皇
C.楚庄王
D.晋文公
参考答案:B
—Would you like ______ some fruit?
—No thanks. I don’t feel like _____ anything now.[ ]
A. to have; to eat
B. having; to eat
C. to have; eating
D. having; eating
辣根过氧化物酶标记的化学发光免疫分析仪常用的发光底物为()
A.AMPPD
B.吖啶酯类
C.鲁米诺
D.三联吡啶钌
E.TPA