下列哪个指标是参数()。A.样本均数 B.总体标准差 C.样本均数 D.样本方差 E

题型:单项选择题

问题:

下列哪个指标是参数()。

A.样本均数

B.总体标准差

C.样本均数

D.样本方差

E.中位数

考点:卫生人才评价考试卫生统计学卫生统计学题库
题型:单项选择题

决定物在平面镜中成像大小的因素是 

A.镜的大小

B.像到物的距离

C.物到镜的距离

D.物的大小

题型:单项选择题

治疗各期血吸虫病可选用:

A.乙胺嗪

B.吡喹酮

C.二者均是

D.二者均否

题型:单项选择题
I spent two months with an American family last year when I studied in America.It is said that “The best house is in the U.S.A., the best wife is in Japan and the best food is in China.”So I took 36    and pleasure to   37    “the best food” for my American family.Each day,regardless of my poor skill of cooking,I performed my play in  38   way:changing the dishes’colour,the meat’s type or the soup’s style.Thus,my American friends could discover the    39   of eating Chinese food. Because of my“      40    ” job,I was often rewarded by their    41  of  appreciation , such as “very  tasty”,“excellent”etc.But the joke was here: yesterday, I cooked Sichuan-style    42  for dinner.I was   43   at my achievement.When all the family members arrived at the table,they first looked     44  at the fish,then looked at me. “Why do all the fish have their    45   ?” they asked,“It’s horrible!” Horrible or beautiful? I don’t know. But I    46  know that fish heads are delicious. The    47   is the best part of fish; in    48    only the respectable guest can have the special     49  of enjoying it. Another                      50     thing is:the American friends often said to me“    51 ”as they  52   fruits or other things. According to Chinese tradition,I would simply smile in answer to their kindness 53 actually helping myself to any of the food.     54  ,I said “help yourself” to them whenever I brought home fruits.Dear me,no matter how much or how often I brought home food, as long as it was nice to their taste,they    55  hesitated to use their hands to “help themselves” until all was finished. 
小题1:
A.worryB.attentionC.delightD.pride
小题2:
A.buyB.fetchC.cook D.leave
小题3:
A.theirB.a newC.the sameD.a simple
小题4:
A.wayB.joyC.troubleD.importance
小题5:
A.hardB.dailyC.goodD.new
小题6:
A.expressionsB.sentenceC.doingD.smile
小题7:
A.meatB.fishC.soupD.egg
小题8:
A.praisedB.pleasedC.badD.surprise
小题9:
A.pleasedlyB.excitedlyC.surprisedly D.worriedly
小题10:
A.bonesB.flesh (人肉)C.tailsD.heads
小题11:
A.doB.willC.want toD.should
小题12:
A.tailB.headC.soupD.flesh
小题13:
A.factB.ChinaC.USAD.the West
小题14:
A.honourB.seatC.tableD.plate
小题15:
A.realB.excitingC.interestingD.easy
小题16:
A.please help us B.excuse meC.help yourselfD.eat them please
小题17:
A.brought homeB.wantedC.were buyingD.were eating
小题18:
A.notB.but notC.withoutD.nor
小题19:
A.At lastB.Above allC.After all D.In return
小题20:
A.usualB.oftenC.neverD.had
题型:单项选择题

尼罗河的入海口在哪座城市?()

A.圣彼得堡坦桑尼亚

B.坦桑尼亚

C.威尔逊

D.开罗

题型:单项选择题

以下关于钙拮抗剂的说法不正确的是()

A.降压疗效的个体差异性较小

B.可作为长期控压药使用

C.主要缺点是治疗初始阶段有反射性交感活性增强

D.无禁忌症

E.降压作用起效迅速而强力

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