当运动物体所受合力的方向跟它的速度方向______,物体就做曲线运动.
若物体所受合力与速度在同一条直线上,物体做直线运动,若不在同一直线上则做曲线运动,
故答案为:不在同一直线上
第二节 将下列汉语译成英语,注意用适当的形式.(共10小题,每小题10分,满分10分)
小题1:Everyone may (犯错;出错误), but we should improve ourselves from mistakes.
小题2:Many famous photos are (展览,陈列) in this exhibition.
小题3:Don’t (放弃)!Your dream will come true.
小题4: (目前;现在),there are lots of activities for students to take part in.
小题5:If people obey the (交通规则),there will be fewer accidents.
患者男,21岁,下颌呈相对后退位,下颌角大,口唇闭合呈现口唇肌肉紧张。覆Ⅲ度,覆盖7mm,磨牙远中咬合关系,上颁拥挤4mm,ANB为8°,SNA为81°,下颌无拥挤,下前牙略唇倾,Spee曲线曲度3mm
整平Spee曲线需要间隙为()。
A.1mm
B.2mm
C.3mm
D.4mm
E.5mm