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【单选题】
What is the functionality of the "Allow modifications of customized objects" check box in the OracleWorkflow Builder dialog box that is displayed from the Help menu? （）(Choose two.)A.
Having check box selected is equivalent to Workflow Definitions Loader Upgrade mode.
B.
Having check box deselected is equivalent to Workflow Definitions Loader Upload mode.
C.
If the check box is not selected, you can save your edits only to protected objects that you have access to change, and cannot overwrite previously customized objects
D.
If the check box is selected, you overwrite any protected objects that you have the ability (access) to modify, and also any previously customized objects.
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【简答题】(电话用语)我找Nancy。
【单选题】图示轴颈 1 在驱动力矩 Md 作用下等速运转, Q 为载荷,图中半径为ρ的细线圆为摩擦圆,则轴承 2 作用到轴颈 1 上的总反力 F R21 应是图中所示的 ( ) 作用线。
A.
B.
C.
D.
D
【单选题】力 F的作用线在OABC平面内,如图所示,则F对Ox、Oy、Oz轴之矩为()
A.
Mx（F）≠0 My（F）≠0 Mz（F）≠0
B.
Mx（F）≠0 My（F）≠0 Mz（F）=0
C.
Mx（F）=0 My（F）≠0 Mz（F）≠0
D.
Mx（F）≠0 My（F）=0 Mz（F）≠0