对流扩散速率（）分子扩散速率。
A.远大于
B.略大于
C.小于
D.等于
参考答案：A
It is generally considered unwise to give children ________ they wants.
A．however
B．no matter how
C．whatever
D．no matter what
以下（）不是无衬里消防水带特点。
A.重量轻
B.体积小
C.耐压低
D.成本低
