肛裂治疗原则以（）为目的，区别不同病变合理施治，急性早期肛裂可采用（）。
参考答案：止痛和促进溃疡愈合｜保守治疗
Peter’s jacket looked just the same as Jack’s, but it cost ___________his.
A．as much twice as
B．twice much as
C．twice as much as
D．as twice much as
一个带正电的粒子在垂直于匀强磁场的平面内做匀速圆周运动，如图所示，当磁感应强度均匀增大时，此粒子的
A．动能不变
B．动能增大
C．动能减小
D．以上情况都可能
