抛掷一枚6个面上分别刻有1,2,3,4,5,6个点的均匀小立方体,“小立方体落地后,朝上一面的点数能被10整除”这个事件是( )事件。
“不可能事件”或“确定事件”
— Our holiday cost a lot of money.
— That doesn't matter _____ you enjoyed yourselves. [ ]
A. so long as
B. unless
C. even though
D. while
机械损失,即为()等机械摩擦以及叶轮圆盘摩擦所消耗的功率。
A.轴承
B.联轴带
C.皮带轮
D.轴承、联轴节、皮带轮