集合管应放在易于定期检查和（）地方。

三角形的面积是平行四边形面积的一半。[ ]

论述运动性疲劳产生的原因及常用判断疲劳的生理学指标。

句型转换。

1. It's very wet and cloudy today.(对画线部分提问)

_____ is the weather _____ today?

2. Helen usually comes to school on foot.(改为同义句)

Helen usually _____ _____ school.

3. You mustn't play football in the street.(改为祈使句)

_____ _____ football in the street.

4. The girl went to the hospital with the old woman.(改为否定句)

The girl _____ _____ to the hospital with the old woman.

5. There is a woman doctor in the hospital.(改为复数)

There _____ some _____ doctors in the hospital.

在口咽检查时应观察腭垂（）

A.有无充血，溃疡或新生物

B.有无下塌或裂开，双侧运动是否对称

C.是否过长，分叉

D.有无淋巴滤泡增生，肿胀和隆起

E.形态，有无瘢痕，隐窝口有无脓栓或干酪样物

高压隔离开关的每一极用两个刀片有什么好处？