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【单选题】
应用口服补液时，口服补液盐中所含葡萄糖的作用主要是A.
使口服液具有一定的渗透压
B.
提供能量
C.
增加小肠对钠、水的重吸收
D.
利用渗透利尿作用排泄毒素
E.
治疗酮症酸中毒
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举一反三
【单选题】Which of the following is discussed in the third paragraph?
A.
The same noise level produces a different effect on land and in the ocean.
B.
Different places may have different types of noises.
C.
The decibel is not a suitable unit for measuring underwater noise.
D.
Different ocean animals may have different reactions to noises.
【简答题】表征系统的输出量最终复现输入量的程度, 用( )来描述
【简答题】The government _____ air quality in areas from level one to five: excellent, fairly good,slightly polluted, poor and erous. A arranges B. classifies C. distributes D. divide...
【单选题】If the signal is very large compared to the noise level, then . 【 】
A.
the signal-to-noise ratio is poor
B.
a perfect message can take place
C.
it ’ s a terrestrial can take place
D.
the noise power is very strong
【单选题】Because of the loud noise，millions of people in urban areas__________ ．A.cannot watch TV##
A.
Because of the loud noise，millions of people in urban areas__________ ． A.cannot watch TV
B.
cannot have normal conversations in outdoor areas
C.
cannot sleep well during the night
D.
cannot give speech in public
【简答题】稳态响应是 指时间( ) 时系统的输出状态,表征系统输出量最终复现输入量的程度
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