不论异构化化学反应的热效应如何,提高反应温度始终能提高化学反应的速度。()
参考答案:对
22.How close parents are to their children ___________a great effect on the characters of the children.
A.have
B.to have
C.having
D.Has
1纳米=0.000000001米,则7.5纳米用科学记数表示为( )。