I don't think sixteen-year-olds should _____to go to an Internet cafe.
有一个电动机接在电压为6V不变的电源上,用手捏住电动机不让它转动,电流为3A,松手后电动机稳定转动,电流为0.3A.求:
我国年降水量分布的总趋势是( )
若关于x的方程x2−2kx−1=0有两个不相等的实数根,则实数k的取值范围是( )