多缸柴油机正常工作,必须使配气正时。
参考答案:对
--Can you go to the concert with us?
--Sorry, I can’t.I have ________homework to do and I’m _______tired..
A.too much, too much
B.too much, much too
C.much too, too much
D.much too, much too
如图所示,一质量为m的物块放在水平地面上,现在对物块施加一个大小为F的水平恒力使物块从静止开始向右移动距离s后立即撤去F,物块与水平地面的动摩擦因数为求:
(1)撤去F时,物块的速度大小;
(2)撤去F后,物块还能滑行多远?