设a=5，b=4，c=3，d=2，下列表达式的值是 3＞2*b Or a=c An

街区

The mother of a 1B-year-old girl calls the emergency department, suspecting her daughter's abdominal pain may be appendicitis. In addition to pain, her daughter has a fever of 100°F (37.8℃) and has vomited twice. What should the nurse tell the mother ？（）

A．Give the daughter a laxative to rule out the possibility that constipation is causing the pain.

B．Gently press on the left lower quadrant of her daughter's abdomen to test for rebound tenderness.

C．It's most likely the flu because her daughter is too young to have appendicitis.

D．Immediately bring her daughter into the emergency department before the appendix has a chance to rupture.

市场调查工作中，（）阶段是现场实施阶段。

A、搜集资料阶段

B、研究阶段

C、总结阶段

电子控制动力转向一般由转速传感器、车速传感器、电控单元、电动机和电磁离合器等组成。

在数据库物理设计阶段，为基本关系表设计合适的存取方法和存取路径的目的是为了提高数据的______。

A．更改效率

B．插入效率

C．查询效率

D．删除效率