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制动带（抱闸皮）磨损超过其厚度的（）时应及时更换，防止铆钉与制动轮打滑而制动失灵。

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下列哪种储气方式最为经济、最好和最可靠的？（）

A. 利用枯竭的油气田储气
B. 利用岩穴储气
C. 利用含水多孔地层储气
D. 利用盐矿层建造储气库储气

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“天苍苍，野茫茫，风吹草低见牛羊”是北朝民歌《敕勒歌》中的诗句，描写了（）的风光。

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Your network consists of a single Active Directory domain. All servers run Windows Server 2003 Service Pack 2 (SP2). You enable auditing for failed logon attempts on all domain controllers. You need to ensure that a record of failed logon attempts is retained for 90 days on all domain controllers. What should you do? （）

A. From the Security Templates snap-in, open the hisecdc template. Modify the Retain System Log setting.
B. From the Security Templates snap-in, open the securedc template. Modify the Retain Security Log setting.
C. Open the Default Domain Policy. Modify the Retain System Log setting.
D. Open the Default Domain Controller Policy. Modify the Retain Security Log setting.

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加热炉长明灯点燃后容易熄灭，点燃后把火焰调大或适当调整一、二次风门及烟道挡板。（）

A. 正确
B. 错误

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