《煤矿井巷工程质量检验评定标准》规定,井巷采用锚杆支护时,锚杆允许露出托板长度允许偏 发布时间:2017-10-09 13:43 │ 来源:www.tikuol.com 题型:单项选择题 问题: 《煤矿井巷工程质量检验评定标准》规定,井巷采用锚杆支护时,锚杆允许露出托板长度允许偏差()。A.≤50mmB.≤20mmC.≤40mmD.≤30mm
题型:单项选择题 Such animals as dinosaurs died out because they couldn't ________ to the sudden change of the climate.[ ]A. suit B. keepC. adapt D. switch 查看答案