物理题 PowerYou are pulling your sister on a sled to the top of a 19.0 m high, frictionless hill with a 10.0° incline. Your sister and the sled have a total mass of 50.0 kg. You pull the sled, starting from rest, with a constant force of 127 N at

物理题 PowerYou are pulling your sister on a sled to the top of a 19.0 m high, frictionless hill with a 10.0° incline. Your sister and the sled have a total mass of 50.0 kg. You pull the sled, starting from rest, with a constant force of 127 N at finish wash talk walk clean cook drop pul 的过去式 I want to be your pen pul的中文意思 请教下步进电机驱动器上缩写词的含义ENA,GND,PUL,CP, 选择题_____ the door open.Don't push it.A.Pulling B.Pull C.To pul 答案是选B,A和C为什么不对呢? begin A; while(p1){ if(p2){ B; }else{ C; }D; } end 这是用PUL书写一段程序.请根据你的理解用N-S图表示 步进电机DM422C驱动器中DIR是什么意思?为什么有的驱动器中DIR有+ ,-之分?还有PUL也有正负之分! 步进电动机驱动器上有好多接口,其中有,pul dir +5v ac bc a+ a- b+b- 其中ac与bc是干什么用的, 常识物理题 请问有人知道物理题物理题物理题物理题x 初中物理题 求几道物理题 一道物理题, 物理题.力 物理题哦 物理题,画图 物理题,急求急求 几个物理题