带式输送机胶带覆盖胶较厚的一面,是托辊接触面,提供胶带长期运行的磨损量,延长使用年限。
参考答案:对
I don’t want to _______ the topic, but why on earth did you get home that late last night?
A.take up
B.make up
C.break up
D.bring up
当水的质量数小于多少时,认为是痕迹?()
A、0.01%
B、0.02%
C、0.03%
C、0.05%