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问题 填空题

家庭灭火知识需要同学们掌握，请填空：

着火类型灭火方法采取这些方法的主要目的
（1）炒菜时油锅着火______目的是：______
（2）木柴着火______目的是：______
（3）电器着火必须先______，而后再用液态CO2灭火器灭火．目的是防止：______

答案

（1）油锅灭火常采用盖锅盖的方法，目的是隔绝空气；

（2）木柴着火常用的方法是加水，目的是降低可燃物的温度到着火点以下；

（3）电器着火必须先切断电源，而后再用液态CO2灭火器灭火．目的是防止触电．

故答案为：家庭灭火知识需要同学们掌握，请填空：

着火类型灭火方法采取这些方法的主要目的
用锅盖覆盖 隔绝空气
加水降低可燃物的温度到着火点以下
切断电源触电

单项选择题

Many theories concerning the causes of juvenile delinquency(crimes committed by young people) focus either on the individual or on society as the major contributing influence. Theories (91) on the individual suggest that children engage in criminal behavior (92) they were not sufficiently penalized for previous misdeeds or that they have learned criminal behavior through (93) with others. Theories focusing on the role of society suggest that children commit crimes in (94) to their failure to rise above their socioeconomic status, (95) as a rejection of middle, class values.
Most theories of juvenile delinquency have focused on children from disadvantaged families, (96) the fact that children from wealthy homes also commit crimes. The latter may commit crimes (97) lack of adequate parental control. All theories, however, are tentative and are (98) to criticism.
Changes in the social structure may indirectly (99) juvenile crime rates. For example, changes in the economy that (100) to fewer job opportunities for youth and rising unemployment (101) make gainful employment increasingly difficult to obtain. The resulting discontent may in (102) lead more youths into criminal behavior.
Families have also (103) changes these years. More families consist of one-parent households or two working parents; (104) , children are likely to have less supervision at home (105) was common in the traditional family (106) . This lack of parental supervision is thought to be an influence on juvenile crime rates. Other (107) causes of offensive acts include frustration or failure in school, the increased (108) of drugs and alcohol, and the growing (109) of child abuse and child neglect. All these conditions tend to increase the probability of a child committing a criminal act, (110) a direct causal relationship has not yet been established.

A．system

B．structure

C．concept

D．heritage
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单项选择题

男性，50岁，3年前曾行胆总管切开取石术，现持续黄疸一个月，肝大肋下3cm，血清胆红素为70μmol/L,BUS显示胆总管直径2cm，下述何种检查方法是最优

A．口服法胆囊造影术

B．静脉法胆道造影术

C．低张性十二指肠造影

D．CT

E．PTC
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