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【单选题】
统计学检验的无效假设应是A.
HO：P1=P2=P3=P4=P5
B.
HO：P1=P2=P3=P4＞P5
C.
HO：π1=π2=π3=π4=π5
D.
HO：π1≠π2≠π3≠π4≠π5
E.
HO：π1=π2≠π3=π4=π5
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举一反三
【单选题】—Is it necessary to look up every new word when I come across it in reading? —No. You ________， because you are likely to guess the meaning from the context.
A.
can't
B.
mustn't
C.
don't have to
D.
ought not to
【单选题】根据以下材料回答题 You must have been troubled by when to say "I love you" because it is one of the greatestpuzzles in our life． "A really good relationship should be about being fair and being equal," says ps...
A.
The importance of 'I love you'．
B.
The meaning of 'I love you'．
C.
The time of saying 'I love you'．
D.
The place of saying 'I love you'．
【单选题】下列收入应该征收企业所得税的是( )。
A.
股息、红利等权益性投资收益
B.
依法收取并纳入财政管理的政府性基金
C.
依法收取并纳入财政管理的行政事业收费
D.
财政拨款
【单选题】— Do you know _________ last night? — Sorry, I don't know. But I think he should go to bed early because he will have an English exam this afternoon. [ ]
A.
when he goes to bed
B.
when he went to bed
C.
when did he go to bed
【单选题】—Could you go swimming with us this afternoon? —Sorry, I can't. I take care of my little sister because my mother is ill. [ ]
A.
have to
B.
can
C.
may
D.
would
【单选题】二甘醇可用作溶剂、纺织助剂等，一旦进入人体会导致急性肾衰竭，危及生命．二甘醇的结构简式是HOCH 2 CH 2 OCH 2 CH 2 OH．下列有关二甘醇的叙述正确的是（ ）
A.
不能发生消去反应
B.
能发生取代反应
C.
能溶于水，不溶于乙醇
D.
符合通式C n H 2n O 3
【简答题】第六段中说线条画一般是繁笔的三条科学道理是什么?请写出原句,并用自己的话概括这三条原理。
【单选题】患者女性82岁，截瘫，长期卧床，近期发现其骶尾部皮肤呈紫色，皮下有硬结，表现出水泡此期的正确护理措施是
A.
无菌纱布包裹，减少摩擦，促进其自行吸收
B.
生理盐水冲洗其受损皮肤
C.
剪破表皮，引流
D.
清除坏死组织
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