由于呼吸衰竭病人的呼吸作功增加,导致能量消耗增加,加上感染不易控制,呼吸肌容易疲劳,因此,临床上应重视给病人 ( )
A. 绝对卧床
B. 营养支持
C. 加强抗感染
D. 保持气道通畅
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男性,57岁,因急性下壁心肌梗死入院。检查:BP 80/50mmHg,心率32次/分,律齐,最可能的心律失常是( )
A. 心房纤颤
B. 房性期前收缩
C. I度房室传导阻滞
D. 室性心动过速
Hydrophilic (water-loving) aggregates, such as silicates, have a greater affinity for water than for asphalt. They are usually acidic and have a ______ surface charge.
Gap-graded aggregates are missing one or more sizes of material. Their gradation curve has a near horizontal section indicating that nearly the same portions of the aggregates pass two different sieve sizes. ______ aggregates are missing small aggregate sizes that would block the voids between the larger aggregate. Since there are a lot of voids, the material will be highly permeable, but may not have good stability.
According to the ASTM D4791, an aggregate particle with the longest dimension to the middle dimension of the particle exceeds the 3 to 1 is an______ particle.