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【单选题】
Alexander lives in an apartment building and gets a $250 benefit from playing his stereo. Mary, who lives next door to Alexander and often loses sleep due to the loud music coming from Alexander’s stereo, bears a $350 cost from the noise. Mary would like to offer Alexander some money to turn down the volume on his stereo. If Mary had to hire a lawyer to draw up the contract, what is the maximum amount she could pay to the lawyer to ensure that both Alexander and Mary would benefit from the agreement?A.
an amount less than $100
B.
an amount between $100 and $250
C.
an amount between $250 and $350
D.
Any amount could result in both parties benefiting from the agreement.
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A.
多为原有肺病基础上发生急剧呼吸困难
B.
有全身缺氧表现
C.
普通供氧常不能缓解缺氧
D.
需选用机械正压通气
E.
进展期X胸片有广泛性点片状阴影
【单选题】关于急性呼吸窘迫综合征的叙述 , 下列哪项不对
A.
多为原有肺病基础上发生急剧呼吸困难
B.
有全身缺氧表现
C.
需选用机械正压通气
D.
普通供氧常不能缓解缺氧
E.
进展期 X 胸片有广泛性点片状阴影
【简答题】若以纵轴表示 ，以横轴表示时间，给出一个直角坐标系，则产品寿命周期呈现为一条S形曲线。
【简答题】在关系运算符中“等于”使用 符号表示。