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举一反三
【单选题】病房中有多位患者需要换药，换药顺序应该是
A.
先无菌的患者，次污染的患者，后感染的患者
B.
先感染的患者，次污染的患者，后无菌的患者
C.
先污染的患者，次感染的患者，后无菌的患者
D.
先无菌的患者，次感染的患者，后污染的患者
E.
先污染的患者，次无菌的患者，后感染的患者
【单选题】吹塑机的开车步骤的正确顺序是（）
A.
先开压缩气，冷却水然后开加热，温度到后开机
B.
先开加热，温度到后开压缩气，冷却水，然后启动液压泵，挤出机，最后开机生产
C.
先开压缩气，冷却水，然后启动液压泵，加热，最后开机
D.
先开加热，然后启动液压泵，挤出机，然后开压缩气，冷却水，最后开机
【单选题】Every year television stations receive hundreds of complaints about the loudness of advertisements. However, federal rules forbid the practice of making ads louder than the programming. In addition, t...
A.
TV stations always operate at the highest sound levels
B.
their sound levels are kept around peak levels
C.
their sound levels are kept in the middle frequency ranges
D.
unlike regular programs their intensity of sound varies over a wide range