过量充气的轮胎哪个部位磨损（）。
A.胎冠中心
B.外侧边
C.a和b
D.a和b处都不磨
参考答案：A
Tom is an easy-going person; as______ consequence, it is easy to make _______ friend(s) with him.
A．a; the
B．a; /
C．the; a
D．the; /
常压炉管穿孔着火的处理
