动滑轮实质是一个动力臂是阻力臂_____的杠杆,使用动滑轮时能省_____力,但费_____ 。
2 倍;一半力;距离
—May I have another cake, Mum?
—Sorry, there is _____.[ ]
A. any more
B. no more
C. some more
D. many more
FIDIC合同条件的计价模式是()
A.总价合同
B.成本加酬金合同
C.单价合同
D.以上合同均可