机组在低速暖机中,转子和缸体因热膨胀不同引起的轴向间隙变化叫差胀。()
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从按摩的治疗目的来说,按摩可分为保健按摩、运动按摩和医疗按摩三个方面。
A. 正确
B. 错误
烧结普通砖的外形为直角六面体.其公称尺寸为:()。
A. 长240mm、宽115mm、高53mm
B. 长240mm、宽180mm、高53mm
C. 长365mrn、宽180mm、高53mm
D. 长365mm、宽115mm、高53mm
肌肉的静力性工作又可分为:()工作、()工作和()工作。
Examine the parameter for your database instance: You generated the execution plan for the following query in the plan table and noticed that the nested loop join was done. After actual execution of the query, you notice that the hash join was done in the execution plan: Identify the reason why the optimizer chose different execution plans.()
A. The optimizer used a dynamic plan for the query.
B. The optimizer chose different plans because automatic dynamic sampling was enabled.
C. The optimizer used re-optimization cardinality feedback for the query.
D. The optimizer chose different plan because extended statistics were created for the columns used.