利用防护罩的特定构造，可防止操作人员与机械的危险部分接触，是指（）
A. 固定式护罩
B. 互锁式护罩
C. 触摸式护罩
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清水勾缝的勾缝深度应符合设计要求，无设计要求时，一般可控制在（）mm为宜。
A. 4-5
B. 5-8
C. 2-5
D. 3-5
在24色色环中，根据位置的不同，颜色间可构成同类色、（）和对比色四种关系。
You notice that a job in a chain has not completed on a nonconstrained RAC database. Which of these are valid reasons why that might occur？（）
A. The job priority is 1 and the resource consumer group CPU emphasis allocation is a low percentage.
B. The job affinity is to a service and one node in that service is unavailable.
C. The job affinity is to an instance and that instance is unavailable.
D. There is no service affinity.
E. None of the above.
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