叙述并指出百会、期门、昆仑的定位。

在下列横线上填入适当的话语，使对话完整、正确。(共5小题，每小题3分，满分15分)

( It’s Friday today. Bob and Dave are talking about their weekend plans.)

Bob: Dave, the radio says it is sunny tomorrow. Do you have any plans?

Dave: 76.________________ I want to go to the beach. 77.________________

Bob: I’m going to do some sports.

Dave: 78.________________

Bob: I like basketball best. I think it can help me grow taller.

Dave: 79.________________

Bob: I will play it in the gym. By the way, who will you go to the beach with?

Dave: I’ll go with my parents.

Bob: 80.________________

Dave: We will go there by car.

Bob: That sounds good. Have a good time.

Dave: The same to you.

链球菌感染后引起的风湿性心脏病的发病机制是（）

A.隐蔽抗原的释放

B.自身成分的改变

C.共同抗原引发的交叉反应

D.免疫调节异常

E.Fas／FasL表达异常

公猪、妊娠哺乳母猪、仔猪一般单栏饲养。（）

受外力作用的弹性直杆中，应力波传播速度与质点振动速度是有区别的，质点振动速度取决于（），而波速传播速度仅为材料性质的（）。

阀门的检修内容有哪些？