动产物权的公示方法为登记，不动产物权的公示方法为占有和交付。 [ ]

阅读理解。

     David got a job in a police station after he left school. He worked there for 42 years and he'll retire this

year. He worked hard in the past 42 years. But he was not a lucky man. He failed to catch a thief. He was

often sorry for it.

     Last weekend, while David's wife was cooking she found there was no salt at home. So she asked her

husband to buy some. In the shop, David saw a young man taking away a wallet from a woman's bag. He

walked to him quietly, but the young man noticed David and ran away at once. David ran after him. At last

the thief ran into a blind alley (死胡同) and David caught him.

     "Please give me a chance, sir." said the thief

     "Who can give one to me?" said David, "I'll soon retire and I catch a thief for the first time!"

( )1. David worked hard in the past 42 years.            

( )2. David was a lucky man, and he often caught thieves.

( )3. Last weekend his wife asked him to buy some sugar. 

( )4. A young man was stealing a woman's wallet in a shop.

( )5. The young man was the first thief that David caught.

列管换热器包括有( )。

A．夹套式换热器

B．固定板式换热器

C．浮头式换热器

D．U形管换热器

根据能量守恒定律可知，下列说法正确的是（　　）

A．随着科技的发展，永动机是可能制成的

B．太阳照射到地球上的光能转化为其他形式的能量，但照射到宇宙的能量就消失了

C．“既要马儿跑，又让马儿不吃草”的想法是违背能量转化和守恒定律的

D．有种“全自动”手表，不用上发条，也不用任何形式的电源，却能一直走动，说明能量也可以无条件的产生

可控振荡器设置的目的是什么？

斗轮系统检修项目有哪些？