男性，42岁。患重型急性胰腺炎伴休克36小时，经抗休克治疗后行胰腺和其周围坏死组织清

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. "

异步电动机反接制动的特点为( )。

A．在任何转速下制动都有较强的制动效果
B．制动转矩较大且基本恒定
C．制动开始时，直流电动机电枢或交流电动机定子上相当于施加两倍额定电压，为防止初始制动流过大，应串入较大阻值的电阻，能量损耗较大，不经济
D．制动到零时应切断电源，否则有自动逆转的可能

既有较强的气道平滑肌松弛作用，又有抗炎作用的药物是（）

A.β受体激动剂

B.抗过敏药

C.茶碱

D.抗胆碱药

E.祛痰药

寄往日本航空挂号盲人读物一件，重600克，应收费（）元。

A.44

B.0

C.8

D.36

轴承一般可分为两大类：滑动轴承和（）。