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试分析发动机油底壳油面升高的原因有哪些？

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通常将不宜雨淋日晒，而对空气中温度及有害气体反应不敏感的材料存放在（）。

A. 仓库
B. 库棚
C. 料场
D. 露天

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标准化法规定：强制性标准，必须执行。不符合强制性标准的产品，禁止生产、销售和（）。

A. 进口
B. 出口
C. 流通
D. 使用

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You are the administrator of an Active Directory domain. The network contains a Windows Server 2003 domain controller named Server1Users report that they experience intermittent delays when they log on to Server1. Administrators report that replication attempts between Server1 and other domain controllers are occasionally delayed.You need to verify the cause of the intermittent connection delays to Server1. You also need to find out whether the problem is related to a hardware deficiency on Server1. You need to track these delays over a period of one day. What should you do first？（）

A. Run the netdiag /verbose command to perform a network diagnostic test on Server1.
B. Run the replmon command to view the Active Directory replication status on Server1.
C. Use Network Monitor to view the network traffic packet contents between Server1 and all other computers.
D. Create a System Monitor counter to track the queue lengths on the network adapter on Server1.

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在一个长度为n（n＞1）的单链表上，设有头和尾两个指针，执行（）操作与链表的长度有关。

A. 删除单链表中的第一个元素
B. 删除单链表中的最后一个元素
C. 在单链表第一个元素前插入一个新元素
D. 在单链表最后一个元素后插入一个新元素

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