在软件设计中,不属于过程设计工具的是【 】。A．PDL(过程设计语言) B．PA

下面各题划线部分都是错误的，请将正确答案写在题后横线上。

1. There are many smell houses in the village. ___________________

2. My grandparents don't like to live in the sity. ___________________

3. What do you do on Sondays? ___________________

4. It's Fliday today. ___________________

5. There are many flowers hear the house. ___________________

如图甲所示，空间存在B=0.5T、方向竖直向下的匀强磁场，MN、PQ是处于同一水平面内相互平行的粗糙长直导轨，间距L=0.2m，R是连接在导轨一端的电阻，ab是跨接在导轨上质量为m=0.1kg的导体棒．从零时刻开始，通过一小型电动机对ab棒施加一个牵引力，方向水平向左，使其从静止开始沿导轨做加速运动，此过程中棒始终保持与导轨垂直且接触良好．图乙是棒的v-t图象，其中OA段是直线，AC段是曲线，CE段是平行于t轴的直线，小型电动机在12s末达到额定功率P=4.5W，此后保持功率不变，在t=17s时，导体棒达到最大速度10m/s．除R外，其余部分电阻均不计，g=10m/s²．

（1）求导体棒ab在0-12s内的加速度大小；

（2）求导体棒与导轨间的动摩擦因数μ及电阻R的阻值；

（3）若导体棒ab从0-17s内共发生位移102m，试求12-17s内，R上产生的焦耳热量是多少．

Complete the sentences with the given words in their suitable forms. (共8分)

小题1:Some parents purchase new _______________ (toy) for their kids before Christmas.

小题2:All the classmates took the difficult exam, but only _______________ (fifth) of them passed.

小题3:They were proud to say these paintings belonged to _______________ (they).

小题4:The professor made an interesting _______________(speak) at the meeting. 

小题5:Children were fond of reading _______________ (excite) stories in their free time. e

小题6:They had a(n) _______________ (happy) trip because of the bad weather.

小题7:PM2.5 is _______________ (main) caused by air pollution in some parts of the country.

小题8:The doctor is ready to _______________ (operation) on his broken leg.

CD4+Th细胞在抗体生成起重要作用。其作用机制是（）

A.活化的Th细胞通过BCR与B细胞相互作用

B.细胞

C.活化Th细胞表达CD40L，为B细胞活化提供协同刺激信号

D.Th细胞分泌IL-1帮助募集更多的

E.活化的Th细胞合成MHC-Ⅱ类分子将抗原提呈给B细胞

缓冲料箱停车时应当先停计量螺杆，再停供料螺杆。