Ⅳ类关节腔积液常见于A．Reiter综合征 B．血友病 C．晶体性关节炎 D．系统性

（11分）测定某电阻丝的电阻率”实验

（1）实验中，用螺旋测微器测量一种电阻值很大的电阻丝直径，刻度位置如图所示，则电阻丝的直径是____cm。

（2）用多用电表的欧姆挡粗测这种电阻丝的阻值：

已知此电阻丝的阻值约为几十千欧，下面给出了实验操作步骤

a.旋转选择开关S，使其尖端对准交流500V挡，并拔出两表笔

b．将两表笔短接，调节欧姆挡调零旋钮使指针对准刻度盘上欧姆挡的零刻度，而后断开两表笔

c．将两表笔分别连接到被测电阻丝的两端，测出阻值后，断开两表笔

d．旋转选择开关S，使其尖端对准欧姆挡的某一挡位

合理的实验步骤顺序是：_______（填写相应的字母）。旋转选择开关其尖端应对准的欧姆挡位是    ；根据该挡位和表中指针所示位置，电阻丝的阻值约为_______Ω。

（3）用电流表和电压表较精确测定此电阻丝的阻值，实验室提供下列可选用的器材:

电压表V(量程3V，内阻约50kΩ)

电流表A₁(量程200μA，内阻约200Ω)

电流表A₂(量程5mA，内阻约20Ω)

电流表A₃(量程0.6A，内阻约1Ω)

滑动变阻器R(最大阻值1kΩ)

电源E(电源电压为4V)

开关S、导线

a．在所提供的电流表中应选用    (填字母代号)；

b．在虚线框中画出测电阻的实验电路；

（4）分别用L、d、R_X表示电阻丝的长度、直径和阻值，则电阻率表达式为ρ=          。

腹痛可见

A．白睛发红
B．两眦赤痛
C．睑缘赤烂
D．全目赤肿
E．两眦红润

When unscrupulous people shoplift, a vicious cycle results. Retailers must raise their prices in order to make up for the lost sales, and the higher prices encourage more people to shoplift. This vicious cycle hurts honest consumers worst of all, because they have to pay higher prices.
The vicious cycle described above could not happen unless which of the following is true ？（）

A. Shoplifters usually steal only items that they need but cannot afford.

B. Retailers do not take shoplifting losses into account when they initially set their prices.

C. The best way for retailers to address shoplifting is by punishing shoplifters to the tallest extent of the law.

D. Some people would shoplift no matter how low retailers set their prices.

E. It costs retailers more to pay security guards to prevent shoplifting than just to absorb the cost of occasional losses due to theft.

偏外苔(舌尖为外)多是

A．邪气入里未深，胃气却先伤
B．表邪虽减，胃滞依然
C．肾阳不能上蒸
D．肾阴不能上濡

若有说明语句 char a[]="It is mine"； char*p="It is mine"； 则以下不正确的叙述是

A．a+1表示的是字符t的地址

B．p指向另外的字符串时，字符串的长度不受限制

C．p变量中存放的地址值可以改变

D．a中只能存放10个字符