结合抖动主要由()引起。
A.指针调整
B.速率变化
C.频偏
D.误码
参考答案:A
小题1:account
A.acid
B.chemical
C.church
D.charity小题2:pollute
A.consult
B.produce
C.industry
D.blue小题3:forecast
A.astronomy
B.disaster
C.arrival
D.wave小题4:located
A.crowded
B.developed
C.allowed
D.amazed小题5:flood
A.mushroom
B.Booth
C.blood
D.took
A.它们做匀速圆周运动的周期相等
B.它们做匀速圆周运动的向心加速度大小相等
C.它们做匀速圆周运动的向心力大小相等
D.它们做匀速圆周运动的半径与其质量成正比