破碎机长期停用再次启动前应检查项目不包括（）。A、轴承是否润滑B、减速机C、同步齿轮

This was not going to be a Mother’s Day as before. A lot of things had changed in the last few months. Usually we would give Mom flowers and take her out for a big meal. We couldn’t afford it this year.

Since I was born, Mom had been able to stay at home with me. We always had enough money to go out to eat two or three times a week if I had behaved well.

All that changed in January.

I could tell that Dad was getting a little angry. Mom would tell me to be quiet and let him rest at night. He’d work later and later.

Beginning in February, Dad tried hard to find another job. But it wasn’t easy for him to find something at the level he used to. He could not bring in as much money. That’s when he asked my mom to go back to work.

After a couple of weeks, Mom found a full-time job at a bank. The pay would be a big help to the family, but now Mom would not be around as much. I didn’t like it. I now had to stay in the after-school care program instead of going home and playing in my neighborhood. Too bad was, as soon as I did get home, I had to help get dinner ready, because Mom wouldn’t get home until after 6:00. I really missed the past time.

a)        This was not going to be a Mother’s Day as before because the writer’s father wasn’t in

b)       The writer’s home used to be rich. 

c)        His family changed because his father was mad.

d)       In February, the writer’s mother started to work at a bank.

e)        The writer really wanted his mother to stay with him

患者，男性，62岁，因“反复咳嗽、咳痰10年，加重伴气促2年”来诊，既往有吸烟史40年。查体：血压130／80mmHg，心率98次／分，呼吸22次／分，桶状胸，双肺散在干啰音，可闻少许湿啰音。心律齐，各瓣膜听诊区未闻杂音，双下肢无水肿。

本例最可能的诊断是（）

A.慢性支气管炎

B.慢性阻塞性肺疾病

C.慢性充血型心力衰竭

D.支气管哮喘

E.气胸

烯烃被酸性高锰酸钾溶液氧化的规律是烯烃中双键断裂，双键两端的基团：＝CH₂变成CO₂；＝CHR变成RCOOH；变成。现有某溴代烷A，分子式为C₄H₉Br，在NaOH醇溶液中加热得到有机物B，B被酸性KMnO₄溶液氧化后不可能得到的产物是

A．HCOOH和CH₃CH₂COOH

B．CO₂和CH₃COCH₃

C．CO₂和CH₃CH₂COOH

D．CH₃COOH

厚壁轴瓦龟裂严重时应采用（）修理。

A．修刮

B．换新

C.重浇轴承合金

D．焊补

什么是大停电？