新生儿坏死性小肠结肠炎（NEC）的X线腹平片特征是（）
A. 肠壁串珠状透亮区
B. 上腹部双泡征
C. 上腹部三泡征
D. 见一大液平
E. 见腹腔空白伴双泡征
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护轨平直部分轮缘槽标准宽度为42mm。容许误差为（）。
A. -1mm
B. +3mm
C. ±3mm
D. +3mm，-1mm
工业上原油脱盐脱水的方法有（）法，化学法和（）法.
A node in a three-node cluster was started， ad it acquired the following three cascading resourcegroups： ’rg1’， ’rg12’， and ’rg3’. The cluster design is to have ’rg1’ normally Node ’A’， ’rg2’ normally on Node ’B’， and rg3’ normally on Node ’C’. How can the administrator reposition the resource groups and correct the problem？（）
A. Change the cluster resource group definitions from cascading to rotating，synchronize the cluster，and restart HACMP
B. Edit the /urs/es/sbin/utilities/clhosts file to reflect he desired node-to-resource group relationships and restart HACMP
C. Use the clRGMove utility move rg2 o Node ’B’ and rg3 to Node ’C’，then start the cluster manager on Nodes ’B’ and ’C’ with the clstart utility
Disable Inactive Node Takeover，check the node priority list in the resource groups definitions，synchronize the cluster，and start HACMP on Nodes ’B’ and ’C&rsquo
排球比赛每局均无最高分限。
A. 正确
B. 错误
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