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
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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.
楼梯平台的主要作用是（）。
A. 缓解疲劳
B. 改善视野
C. 受力
D. 采光
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