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Ames试验利用的材料为（）型的鼠伤寒沙门氏菌，该菌在缺乏或少含量的（）的低营养培养基上不能生长。

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Your network contains two servers named Server1 and Server2 that run Windows Server 2008 R2.From Server1, you create a collector-initiated subscription that uses Server2 as a source computer.You verify the event subscription and discover the error message shown in the exhibit. (Click the Exhibit button.) You need to ensure that the subscription collection runs successfully. What should you do？（）

A. On Server1, run winrm quickconfig.
B. On Server2, run winrm quickconfig.
C. From the properties of the subscription, modify the User Account options.
D. From the properties of the subscription, modify the Protocol and Port options.

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投机风险是指既可能造成损失也可能创造额外收益的风险。

A. 正确
B. 错误

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弯销侧抽芯机构与斜导柱抽芯结构结构上有何区别？

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在电力系统非正常状况下，供电频率允许偏差不应超过±1.0赫兹。

A. 正确
B. 错误

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