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象征符具有哪些特性？

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假想将机件的倾斜部分旋转到与某一选定的基本投影面平行后，再向该投影面投影所得到的视图称为（）。

A. 基本视图
B. 斜视图
C. 局部视图
D. 旋转视图

You are designing an upgrade strategy for a Windows Azure application that includes one web role with one instance. You have the following requirements： - Test the application on the Windows Azure platform. - Ensure that application upgrades can be rolled back. - Ensure that upgrade and rollback processes do not cause downtime. You need to recommend an approach for upgrading the application. What should you recommend？（）

A. Deploy to the Production slot. Test the application， and then perform a VIP swap.
B. Deploy to the Staging slot. Test the application， and then perform a VIP swap.
C. Deploy to the Staging slot. Test the application， and then perform a manual in-place upgrade to the Production slot.
Deploy to the Staging slotTest the application， and then perform an automatic in-place upgrade to the Production slot.

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采煤机没有牵引链，就完全避免了液压马达（）的事故。

A. 吸空；
B. 泄漏；
C. 反链敲缸；
D. 配油轴咬死。

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急性肾功能衰竭少尿期病人需要紧急处理的电解质紊乱是（）

A. 低钠血症
B. 低氯血症
C. 高钾血症
D. 低钙血症
E. 高磷血症

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