下列叙述中,属于生物因素对生物影响的是( )
A:“春来江水绿如蓝”
B:“雨露滋润禾苗壮”
C:“草盛豆苗稀”
D:“竹外桃花三两枝,春江水暖鸭先知”
— Nowadays more and more foreigners are becoming interested in Beijing Opera.
—That's true. It's an important part of Chinese____________.
把质量为m的正点电荷q从电场中某点静止释放(不计重力)下列说法正确的()