（）的带式输送机，必须设置防护遮板。
A.机架较低
B.机架较高
C.机架适中
参考答案：B
— Shall we have a talk with her and try to persuade her not to see a movie tonight?
— There is no ______ talking to her.She never listens. [ ]
A. goods
B. value
C. point
D. worth
星系具有哪五种属性？
