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【单选题】
在休克患者护理中，下列哪项不正确（ ）A.
开放两路静脉通道
B.
保持呼吸道通畅和吸氧
C.
给予平卧位
D.
四肢冰冷时用热水袋保暖
E.
准确记录出入水量
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反馈参考答案：
举一反三
【简答题】若3x等于5y，则x：y=______．
【单选题】The invisible hand usually leads markets to allocate resources efficiently.
A.
assign
B.
persuade
C.
ask
D.
order
【简答题】先化简，再求值： （1）若x=﹣1，y=0.5，则（x﹣5y）（﹣x﹣5y）﹣（﹣x+5y） 2 =（ ）； （2）若x=2，y=﹣3，则 =（ ）。
【单选题】When the "invisible hand" guides economic activity, prices of products reflect
A.
only the values that society places on those products.
B.
only the costs to society of producing those products.
C.
both the values that society places on those products and the costs to society of producing those products.
D.
none of the above; when the "invisible hand" guides economic activity, prices of products are set by the government in a manner that is thought to be "fair."
【单选题】The invisible hand of the marketplace acts to allocate resources
A.
fairly but does not necessarily ensure that resources are allocated efficiently.
B.
efficiently but does not necessarily ensure that resources are allocated fairly.
C.
both fairly and efficiently.
D.
neither fairly nor efficiently.
【单选题】宽带（宽频）探头，不包括下列含义
A.
发射很宽的频带，如2～5MHz范围
B.
接收所有频率，即2～12MHz回声，包括近远程
C.
接收所有频率限于中近程，远程只能接收较低频率
D.
在接收的回声中选择某一特定的中心频率
E.
近程取高频，中程取中频，远程按低频，即动态接收
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