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【单选题】
男性胸创伤患者，诊断右侧闭合性血胸，已作胸膜腔引流术，第1次引流出血性液体850ml，快速输血补液后，第1小时又引流出220ml，第2小时120ml。体查：血压12/9kPa90/67.5mmHg，心率100次/分，呼吸26次/分，面色仍较苍白，气管无明显移位。对该患者较好的治疗选择：A.
输血补液，继续观察
B.
应用止血药物
C.
应用血管活性药物
D.
气管切开或气管插管，人工辅助呼吸
E.
紧急剖胸探查
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举一反三
【单选题】11) Constant returns to scale implies that if N and K both increase by 3% that
A.
Y/N will increase by less than 3%.
B.
the capital-labor ratio will increase by 3%.
C.
output (Y) will increase by 3%.
D.
Y/N will increase by 3%.
【单选题】Refer to Exhibit 11-16. The region 'y' refers to:
A.
diseconomies of scale.
B.
constant returns to scale.
C.
minimum efficient scale.
D.
economies of scale.
【单选题】Refer to Exhibit 11-16. The region 'z,' where the long-run ATC rises at the higher levels of output, refers to:
A.
diseconomies of scale.
B.
constant returns to scale.
C.
minimum efficient scale.
D.
economies of scale.
【单选题】Refer to Exhibit 11-16. The region 'x' refers to:
A.
diseconomies of scale.
B.
constant returns to scale.
C.
minimum efficient scale.
D.
economies of scale.
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