【单选题】重载、冲击不大、负载稳定的滑动轴承的轴瓦材料应选用
【单选题】—Do you think our teacher is ________ ? —Yes, he always corrects our homework and prepares his lessons _______.
【单选题】Our English teacher always helps us _____ our English. [ ]
【单选题】—Do you think our teacher is ?—Yes, he always corrects our homework and prepares his lessons .
A.
—Do you think our teacher is____? —Yes, he always corrects our homework and prepares his lessons____. A.careful; careful
【单选题】打桩过程中遇到以下哪种情况不必暂停作业( )
【判断题】我国旅游饭店分为五个星级,即一星级、星级、三星级四星级、五星级(含白金五星
【单选题】一质量为M=15kg、半径为R=0.3m的圆柱体,可绕与其几何轴重合的水平固定轴转动(转动惯量 )。现以一不能伸长的轻绳绕于柱面,而在绳的下端悬一质量m=8.0kg的物体,不及圆柱面和轴之间的摩擦,则物体自静止下落,5s内下降的距离是()。
【单选题】一质量为M=15kg、半径为R=0.3m的圆柱体, 可绕与其几何轴重合的水平固定轴转动(转动惯量 )。现以一不能伸长的轻绳绕于柱面, 而在绳的下端悬一质量m=8.0kg的物体, 不计圆柱面和轴之间的摩擦, 物体自静止下落, 则绳中的张力是()。