氯化钠等渗当量是指（） A.1g药物呈现的等渗效应相当于氯化钠的克数 B.1g氯

By the time Jack returned home from England，his son ________ from college.(2011·辽宁)

A．graduated

B．has graduated

C．had been graduating

D．had graduated

人们常常把保险比喻为“晴天的雨伞”、“生命的防火墙”。下列关于商业保险理解正确的是

①是一种合同行为                   ②具有“人人为我，我为人人”的互助特征 

③能把不确定的风险变成确定性的成本 ④具有防患于未然的作用

A．①②③

B．②③④

C．①②④

D．①②③④

肾综合征出血热低血压休克期，下列哪项是错误的？（）

A.一般在病程4～6天出现

B.可因继发感染所致

C.急性起病，体温增加至40℃

D.血液浓缩引起血容积正常或轻度升高

E.此期可与少尿期重叠同时出现

“自我效能”的意思是一个人是否有能力成功地完成（）的事情。

A、他人安排

B、他人期望

C、自我提升

D、自我希望

All known techniques for handling complex problems successfully seem to fall into one of the three classes: subdividing the problem (51) , ignoring irrelevant detail in a safe way (52) , and having an independent agent (53) the internal consistency (contextual checking). The first two provide guidelines for solving the problem, the third serves to provide early warnings. A good programming language supports all three.
In subdividing problem, some of the subproblems may be similar to the (54) problem. It leads us to a (55) solution. This (55) solution is viable provided each of the subproblems is easier to solve than the original problem.

A．abrogation

B．abstraction

C．composition

D．contraction