(1)作出图的铡刀使用中的两个力臂,并表明L1和L2.
(2)画出图所示斜面上小球所受重力的示意图.
(3)在图所示的滑轮组上绕线,使匀速提升重物G时最省力.
(1)
(2)
(3)
With the machine ____, she couldn't keep her eyes ___ in bed.
A.burning, closed
B.burnt, close
C.to burn, closed
D.being burnt, close
气虚便秘的治法为
A.行气通便
B.润肠通便
C.益气润肠
D.温阳通便
E.理气导滞