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多项选择题

柴油机技术状况一般可通过检查发动机的()等外部特征参量来判定。

A．机油压力
B．曲轴箱窜气量
C．机油消耗量
D．气门间隙
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单项选择题
Ron was an engineer.He planned a change and tried the new job of teaching kids how to swim.Ron′s easy?manner soon made him a full-time employee at the swim school.
Now,the 40 hours he works a week takes in weekends,early mornings and late afternoons.He earns around?25%less than he did in engineering.But,at 49,he says he has never been happier."I′ve had a drop in pay,but I′ve?cut back on spending,too.I seldom drive to work so don′t have to pay as much for petrol（汽油）.I don′t drink as much.I go walking in my lunch break and I′ve lost 20 kilos.I love going to work.The whole family is a lot happier."
When one of his brothers called,offering to help him find"a real i oh",he answered,"I don′t care.I know what?I′m doing is good."
He admits it was fearful making such a big change when there was the mortgage（分期付款）to pay and kids to clothe and feed,but in the end he feels it is a simple choice."If you′re in a job you don′t like,get out.Money′s not?everything.If you don′t like it,change—find something you′re going to be happy with."
What′s Ron′s advice to the readers?
A.Sticktothejobifyouhavekidstoraise
B.Changethejobifyoudon'tlikeitanymore
C.Sticktothejobifyouhavemortgagetopay
D.Changethejobifyoudon'tgetenoughmoney
单项选择题
依据GB/T18833-2012，反光膜人工加速耐候性试验使用的光源（　　）。
A.紫外灯
B.碳弧灯
C.氙弧灯
D.红外灯
单项选择题
大学毕业生小王在某建筑工程公司设备部工作，负责施工机械管理。由于刚刚参加工作，他对一些建筑机械的业务内容不熟悉，需要给予指导。根据以上背景，请回答下列问题：
建筑机械统计报表共有（ ）种类。
A.3
B.4
C.5
D.6
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