制动瓦衬与制动轮间隙过大，能使制动瓦衬发热、冒烟。
参考答案：错
对瑞氏染色的介绍，正确的说法是（）。
A.偏酸性环境中染色偏蓝
B.偏碱性环境中染色偏蓝
C.偏酸性环境中负电荷增多
D.偏碱性环境中正电荷增多
E.偏碱性环境中易与伊红结合
It to me that I should go to attend a meeting when I was about to go home．
A．happened
B．struck
C．occurred
D．reminded
