Which sign can you probably see in the s 发布时间:2017-06-01 22:33 │ 来源:www.tikuol.com 题型:选择题 问题: Which sign can you probably see in the supermarket?A.B.C.D.
题型:选择题 带式输送机带速的选取,一般按()进行。A.输送带愈宽,允许选取较低的带速B.输送带愈宽,运行愈平稳,允许采用较高的带速;输送机较短应选用较低的带速C.有较大倾斜角的输送机,应选用较高带速 查看答案