一个长螺线管中通有恒定电流,把一个带电粒子沿管轴线射入管中,粒子将在管中(不计重力影响)[ ]
A.做圆周运动
B.沿轴往返运动
C.做匀加速直线运动
D.做匀速直线运动
答案:D
He _____ in his English Test Paper. His teacher was very angry with him. [ ]
A. makes some mistakes
B. make a mistake
C. made many mistakes
比的前项和后项同时乘一个相同的数,比值不变.______.