I like some and some .[ ]
A. milk, hamburger
B. hamburgers, milks
C. milk, hamburgers
答案:C
起重机在5S内将2×103㎏的物体由静止开始匀加速提升10米,此起重机应具备的最小功率是(g取10M/S2)( )
A.40KW
B.80KW
C.73.6KW
D.86.4KW
应急柴油机运转时黑烟或灰烟过多,你判断是什么原因引起的?如何解决?