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商业机会

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列车停站载客时，司机应观察乘客上下车情况，合理掌握关门时机，当发车倒计时至（），乘客上下完毕时，方可关闭车门。

A. 15秒
B. 10秒
C. 20秒
D. 25秒

You are employed as the Exchange administrator at Company.com.The Company.com network contains an Exchange Server 2010 Organization.The Active Directory forest of Company.com contains two sites named ExamWaysA and ExamWaysB.both sites contain 6 mailbox servers.examwaysa contains a mailbox server named -ex01 and examwaysb a mailbox server named ex02.Company.com has a public folder named testdata that is replicated to -ex01 and -ex02.during the course of the week you receive numerous complaints from users stating that they are unable to access the public folder when -ex01 is offline.you receive an instruction from management to resolve this issue as soon as possible.to ensure productivity you decide to make sure that all examways users are able to utilize testdata when -ex01 becomes offline.What should you do？（）

A. you should consider having -ex01 and -ex02 added to a database availability group （dag）.
B. you should consider having -ex01 added to the public folder referrals for examwaysb.
C. you should consider having -ex02 added to the public folder referrals for examwaysa.
D. you should consider having -ex01 and -ex02 added to a client access server array.

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矽肺是长期吸入大量含游离二氧化硅粉尘所引起的肺组织纤维化为主的全身疾病，它是尘肺中进展最快，最为严重，也最常见，影响面较广的一种职业病。

A. 正确
B. 错误

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发动机工作时，首先必须由外力带动（）旋转，即发动机启动。

A. 活塞杆
B. 曲轴
C. 飞轮
D. 燃烧室容积

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