为保证抽油机底座水平,地脚螺栓螺帽上紧后应加止退螺帽,剩余螺纹不得超过()扣。A、1 发布时间:2018-03-16 09:11 │ 来源:www.tikuol.com 题型:单项选择题 问题: 为保证抽油机底座水平,地脚螺栓螺帽上紧后应加止退螺帽,剩余螺纹不得超过()扣。A、1~2B、1~3C、3~5D、2~6
题型:单项选择题 Do you know when _________ he ________ the Football Club ? And how long ______ he _______ it ?A.did join ; has beenB.did join in ; have been a member ofC.did join ; has been inD.has joined ; has been a member of 查看答案
题型:单项选择题 将甲、乙、丙三块等体积并去皮的萝卜条分别放入0.3%、11%和25%的蔗糖溶液中。甲变得硬挺,乙基本无变化,丙变小变软。这说明萝卜细胞液的浓度为[ ]A.低于0.3% B.约为0.3% C.约为25% D.约为11% 查看答案