The clinic nurse is instructing a group of parents about emergency treatment for accidental poisoning and injury. Which of the following statements by one of the mothers indicates that she needs further instruction

A. "I should flush my child’s eye with room temperature tap water for 15 to 20 minutes if a caustic material gets into it. "
B. "I should save the emesis if my child vomits. "
C. "I should call the poison control center if there are any symptoms. "
D. "I should give 2 to 5 teaspoons of clear fluids after administering ipecac. "

（5分）在做“测定金属丝的电阻率”的实验中，若待测电阻丝的电阻约为5，要求测量结果尽量准确，提供以下器材供选择：

A．电池组（3V，内阻约1）

B．电流表（0—3A，内阻约0.0125）

C．电流表（0—0.6A，内阻约0.125）

D．电压表（0—3V，内阻约4 k）

E．电压表（0—15V，内阻约15 k）

F．滑动变阻器（0—20，允许最大电流1A）

G．滑动变阻器（0—2000，允许最大电流0.3A）

H．开关、导线若干

（1）实验时电流表、电压表和滑动变阻器应分别选取           、           和        ．（填写仪器前字母代号）

（2）测电阻时，电流表、电压表、待测电阻在组成测量电路时，应采用电流表       （选填“内”或“外”）接法，测量值比真实值偏         （选填“大”或“小”）