- Today's young people can't live without smart phones.
- They keep their hands on the phones whether they go, even while they ______ meals.
A:have
B:are having
C:were having
D:will have
①提高安全防范意识 ② 网友的要求都应拒绝
③不轻易泄露个人资料 ④杜绝上网避免被骗
将下面的平面图形绕直线旋转一周,可以得到如图立体图形的是( )
如图所示,直线A为电源a的路端电压与电流的关系图象;直线B为电源b的路端电压与电流的关系图象;直线C为一个电阻R的两端电压与电流的关系图象.如果将这个电阻R分别接到a、b两电源上,那么有( )
125×8=____
25×4=____
5+2﹣5+2=____
45+8﹣25=____
0÷43=____
345÷10=____