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过量空气系数A＜0.4时，混合气（），火焰不能传播，发动机熄火，此A值称为火焰传播下限。

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在升压斩波电路中，其输出电压为275V，斩波器的占空比为0.6，则该电路的输入电压为（）。

A. 110V
B. 220V
C. 330V
D. 440V

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电气化铁道无线电辐射干扰在基准距离测量时，测量场地的电磁环境噪声场强至少比来自被测对象的无线电辐射干扰场强的最大值低6dB。

A. 正确
B. 错误

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烩菜的主要成品特点是：汤汁滑利、汤菜交融、汤鲜味美、以鲜咸和酸辣味为主。

A. 正确
B. 错误

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You are the network administrator for Alpine Ski House. The network consists of two Active Directory domains. One domain is named alpineskihouse.com. A subsidiary company named Adventure Works has a domain named adventure-works.com. Both domains are in a single forest.A primary DNS server for alpineskihouse.com is located in the company’s Seattle office. A primary DNS server for adventure-works.com is located in the company’s Portland office. Both DNS servers are Windows Server 2003 computers.Each domain has three regional offices. Each regional office contains the following computers：（1）a secondary DNS server in its respective domain （2）a DHCP server （3）a recently installed Microsoft Internet Security and Acceleration （ISA） Server computer that connects the LAN to the Internet Company sales representatives visit the Seattle office， the Portland office， and all regional offices several times each month. All sales representatives use Windows XP Professional portable computers that are members of the alpineskihouse.com domain.You create an appropriate wpad.dat script file on each of the ISA servers in each regional office. On each DHCP server， you configure the 252 Proxy Autodiscovery option and the corresponding http：//ISAServerName/wpad.dat string value. Sales representatives report that they cannot access the Internet by using Internet Explorer when they visit an office that is in the adventure-works.com domain. You need to ensure that all users can access the Internet at all times. You want to use the minimum amount of administrative effort. What should you do？（）

A. Configure Windows XP Professional portable computers with the primary DNS suffix of adventure-works.com.
B. Configure the Advanced TCP/IP Settings setting on the Windows XP Professional portable computers with a DNS suffix for this connection setting of adventure-works.com.
C. On each DHCP server that is a member of the adventure-works.com domain， configure the 15 DNS Domain Name option to be adventure-works.com.
D. On the primary DNS server for the adventure-works.com domain， add an _http service service locator （SRV） resource record for each ISA server in the adventure-works.com domain.

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