51 Suppose Host A wants to send a large file to Host B. The path from Host A to Host B has three links, of rates R1= 500 kbps, R2= 2 Mbps, and R3= 1 Mbps.
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【简答题】李先生,45岁。建筑工人,工作时不慎从高空跌落,急诊入院。病人气促,脉搏增快,左侧胸部叩诊呈浊音。怀疑为血胸,最可靠的依据是A. 气管移位 B. 呼吸音减弱或消失 B. 呼吸音减弱或消失 C. 胸部X线检查示胸膜腔积液 D. 胸膜腔穿刺抽出不凝固血液 E. 呼吸困难