试述维生素D缺乏佝偻病与维生素D缺乏手足抽搐症发病机制的异同点。

分支不分布至髋关节的神经是（）。

A.坐骨神经的股方肌支

B.臀上神经

C.臀下神经

D.股神经

E.闭孔神经

（1）小灯泡的电阻会随温度的升高而变大. 某同学为研究这一现象，用实验得到它的伏安特性曲线如图（a）所示（I和U分别表示电阻的电流和电压）。要求小灯泡两端电压从零逐渐增大到额定电压以上。

①、可用的器材有：电压表、电流表、滑线变阻器（变化范围：0—10Ω）、电源、电阻、电键、导线若干.）他们应选用下图（a）中所示的　 　　电路进行实验；

②、根据实验测得数据描绘出如下图所示U－I图象，由图分析可知，小灯泡电阻R随温度T变化的关系是T越高R越       （填“大”或“小）。

（2）实验中使用的小灯泡标有1.5 V字样，请你根据实验结果求出小灯泡在1. 5 V电压下的实际功率是　 　　W。

咽后脓肿多局限于一侧是因为（）

A.咽后脓肿多较小、

B.咽壁的纤维组织在后壁正中上形成咽缝

C.咽后隙在中线处被咽缝分隔为左右两部分

D.咽后脓肿形成的脓腔较局限

E.以上均不是

下列反射属浅反射的是（）

A.肱二头肌反射

B.肱三头肌反射

C.膝反射

D.跖反射

E.桡骨骨膜反射

A recent report determined that although only three percent of drivers on Maryland highways equipped their vehicles with radar detectors, thirty-three percent of all vehicles ticketed for exceeding the speed limit were equipped with them. Clearly, drivers who equip their vehicles with radar detectors are more likely to exceed the speed limit regularly than are drivers who do not.
The conclusion drawn above depends on which of the following assumptions

A．Drivers who equip their vehicles with radar detectors are less likely to be ticketed for exceeding the speed limit than are drivers who do not.

B．Drivers who are ticketed for exceeding the speed limit are more likely to exceed the speed limit regularly than are drivers who are not ticketed.

C．The number of vehicles that were ticketed for exceeding the speed limit was greater than the number of vehicles that were equipped with radar detectors.

D．Many of the vehicles that were ticketed for exceeding the speed limit were ticketed more than once in the time period covered by the report.

E．(E) Drivers on Maryland highways exceeded the speed limit more often than did drivers on other state highways not covered in the report.