如图所示，装有水和乒乓球的烧杯静止在斜面上，请在该图中画出乒乓球受力的示意图．
答：乒乓球受力的示意图如下：
Scott was very nervous at the beginning, but finally he _____ his courage to speak it out, and the teacher accepted his apology and forgave him.
A．made up
B．brought up
C．worked up
D．lived up
血栓闭塞性脉管炎的护理，错误的是
A．防止患肢受伤 B．劝告患者戒烟C．局部热敷D．做伯格(Buerger)操E．足部保暖
