( )把正电荷从A端移动到B端所做的功与被移动的电荷比值,称为A、B两端间的电动势 发布时间:2017-12-27 02:06 │ 来源:www.tikuol.com 题型:单项选择题 问题: ( )把正电荷从A端移动到B端所做的功与被移动的电荷比值,称为A、B两端间的电动势。A.电场力B.外力C.电磁力D.电功
题型:单项选择题 People wondered how such a silly and careless mistake _______. [ ]A. came about B. came out C. was happened D. was brought 查看答案
题型:单项选择题 常用于检测高压蒸汽灭菌效果的商品菌片是( )A.枯草芽胞杆菌黑色变种(ATCC9372)B.大肠埃希菌(ATCC25922)C.铜绿假单胞菌(ATCC27853)D.嗜热脂肪芽胞杆菌(ATCC7953)E.金黄色葡萄球菌(ATCC25923) 查看答案