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问题 单项选择题

下列哪一项不是术后必需紧急施行透析的指征

A．因容量负荷过重而引起的心力衰竭

B．未能纠正的严重酸中毒

C．经治疗无效的高钾血症

D．经治疗无效的低钠血症致脑水肿

E．血肌酐达440μmol／L

答案

参考答案：E

单项选择题

下列何种分布中的均数等于方差

A．X2
B．U分布
C．二项分布
D．Possion分布
E．F分布
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单项选择题


Directions: There are 10 blanks in the following passage. For each numbered blank, there are 4 choices marked A, B, C and D.

Historians tend to tell the same joke when they are describing history education in America. It’s the one (51) the teacher standing in the schoolroom door (52) goodbye to students for the summer and calling after them. "By the way, we won World War II."
The problem with the joke, of course, is that it’s not funny. The recent surveys on (53) illiteracy are beginning to numb. nearly one third of American 17-year-olds cannot even (54) which countries the United States fought against in that war. One third have no idea when the Declaration of Independence was (55) . One third thought Columbus reached the New World after 1750. Two thirds cannot correctly (56) the Civil War between 1850 and 1900. Even when they get the answers right, some are just guessing.
Unlike math or science, ignorance of history cannot be (57) connected to toss of international competitiveness. But it does affect our future (58) a democratic nation and as individuals.
The good news is that there is growing agreement on what is wrong with the (59) of history and what needs to be done to fix it. The steps are tentative (尝试性的) (60) yet to be felt in most classrooms.

A．of

B．for

C．with

D．as
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