外科手消毒,监测的细菌菌落总数应≤多少cfu/cm2() A.5 B.10 C.15 发布时间:2018-03-15 21:20 │ 来源:www.tikuol.com 题型:单项选择题 问题: 外科手消毒,监测的细菌菌落总数应≤多少cfu/cm2()A.5B.10C.15D.20
题型:单项选择题 下列离子方程式中,正确的是[ ]A.碳酸氢钠溶液与稀硫酸混合:CO32-+2H+=CO2↑+H2O B.大理石溶于醋酸:CaCO3+2H+=Ca2++CO2↑+H2O C.CO2气体通入CaCl2溶液中:Ca2++CO2+H2O==CaCO3↓+2H+ D.稀H2SO4和Ba(OH)2溶液反应:2H++SO42-+Ba2++2OH-=BaSO4↓ +2H2O 查看答案
题型:单项选择题 For relation R where primary key contains multiple attributes,no non-key attribute should be functionally dependent on a part of the primary key. This relation R is at least in ( )。A.1NF B.2NF C.3NF D.BCNF 查看答案