用下列哪个器材可以作为消耗电能收取电费的依据( ) A.电流表 B.电压表 C. 发布时间:2017-05-20 21:11 │ 来源:www.tikuol.com 题型:选择题 问题: 用下列哪个器材可以作为消耗电能收取电费的依据( )A.电流表B.电压表C.电能表D.测电笔
题型:选择题 (1)已知命题p:方程x2+(m-3)x+1=0无实根,命题q:方程x2+y2m-1=1是焦点在y轴上的椭圆.若¬p与p∧q同时为假命题,求m的取值范围.(2)已知命题p:2x2-3x+1≤0和命题q:x2-(2a+1)x+a(a+1)≤0,若¬p是¬q的必要不充分条件,求实数a的取值范围. 查看答案
题型:选择题 Every packet of cigarettes contains poisonous chemicals that can ____ lung cancer and heart disease. [ ]A. result in B. result from C. deal in D. deal with 查看答案