条刹带上的刹车块（），其固定螺钉要齐全．紧固。
A、要全部更换
B、只更换1/3
C、只更换2/3
D、只更换破损者
参考答案：A
有下列二叉树，对此二叉树中序遍历的结果为( )。
A．ABCDEF
B．BDAECF
C．ABDCEF
D．ABCDFE
Jack thinks English is more interesting than math.
A．Jack thinks math is less interesting than English.
B．Jack thinks math is much interesting than English.
C．Jack thinks English is as interesting as math
D．Jack thinks English is much interesting as math
