【单选题】水泥安定性检测,雷氏夹指针尖端间的距离增加值应不大于( )。
【单选题】水泥安定性检测,雷氏夹指针尖端间的距离增加值不大于( )
【判断题】第28题 机床的空运转试验是空负荷,检查主轴转速从低速依次到高速再到最高速,各级运转时间不少于5min,最高转速时间不少于30min,同时对进给机构也要进行低、中、高进给量的空运转。
【单选题】my opinion, customer service here has improved but not as much as expected over the last 2 years.
【单选题】_______ my opinion, customer service here has improved but not as much as expected over the last 2 years.