线段AB沿和它垂直的方向平移到A'B',则线段AB和线段A'B'的位置关系是 _________ .
平行且相等
錾削时锤击要______、______、______,其动作要一下一下有节奏地进行,一般肘挥时速度约为______左右。
Is monopolistic competition a market in which: each seller produces a differentiated product compete on price, quality, marketing()①A. No No ②B. No Yes ③C. Yes Yes
A. ①
B. ②
C. ③