皮皮学,免费搜题
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【单选题】
痰量较多,呼吸功能尚好的支气管扩张患者最适合的排痰措施是
A.
有效咳嗽
B.
拍背与胸壁振荡
C.
湿化呼吸道
D.
体位引流
E.
机械吸痰
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【简答题】(1)已知y(x+y)+(x+y)(x-y)-x 2 ,其中x=-2,y= ; (2)化简:(x+3y)(2x+y)-(x+2y) 2 -(2x-y)(2x+y).
【简答题】阅读理解。 Have you ever shopped in Beijing? Do you know bargaining (A) is the rule there? At least, it is so in most markets and back-street clothes shops. Bargaining is an art and if you are unfamiliar (...
【单选题】Which of the following statements describes a scenario in which the bargaining power of a supplier is strong?
A.
Competitors have decreased demand for raw materials.
B.
The availability of raw materials is limited.
C.
The supplier has excess inventory.
D.
There are many suppliers providing the same raw materials for comparable prices.
【多选题】从历史长过程看,我国经济发展历程中( )总是在不断形成,经济发展新常态是这个长过程的一个阶段。这完全符合事物发展螺旋式上升的运动规律。
A.
新状态
B.
新格局
C.
新阶段
D.
新平台
【简答题】(-x-y)(x-y)=______(x+y)(y-x).
【单选题】下列变形正确的是(  )
A.
-x+y x-y = -x-y x+y
B.
-x+y -x-y =- x-y x+y
C.
-x+y -x-y = x+y x-y
D.
-x+y -x-y = x-y x+y
【单选题】What is the best title for this passage?
A.
Bargaining and Compromise
B.
Wise Compromise in Britain
C.
Britain and Europe
D.
Setbacks of Compromise
【单选题】若x+y<0,xy<0,x>y,则有(  )
A.
x>0,y<0,|x|>|y|
B.
x>0,y<0,|y|>|x|
C.
x<0,y>0,|x|>|y|
D.
x<0,y>0,|y|>|x|
【单选题】下列等式成立的是(  )
A.
x 2 +y 2 =(x+y)(x+y)
B.
x 2 -y 2 =(x+y)(x-y)
C.
-x 2 +y 2 =(-x+y)(-x-y)
D.
-x 2 -y 2 =-(x+y)(x-y)
【简答题】对任意两个集合X、Y,定义X-Y={x|x∈X且x?Y}、X△Y=(X-Y)∪(Y-X).设A={y|y=x 2 ,x∈R},B={y|y=3sinx,x∈R},则A△B=______.
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