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【简答题】
每日上消化道出血量达________便隐血试验即可阳性；排黑便表明出血量在________以上，胃内血液达________时可引起呕血。
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反馈参考答案：
举一反三
【判断题】If marginal cost is greater than average total cost then average variable cost is increasing andaverage variable cost is decreasing.
A.
正确
B.
错误
【单选题】张女士，32岁，因畏寒、发热、厌油、恶心呕吐、食欲缺乏、乏力就诊，诊断为甲型肝炎，收入院治疗，病人采取的隔离措施哪项不妥
A.
不同病种病人应分室居住
B.
密切接触病人时须穿隔离衣
C.
不同病种病人书报可借阅
D.
病室应有防蝇设备
E.
不同病种病人的食品不可交换
【单选题】设系统的单位抽样响应为h(n)，则系统因果的充要条件为
A.
当 n>0 时， h(n)=0
B.
当 n>0 时， h(n)≠0
C.
当 n<0 时， h(n)=0
D.
当 n<0 时， h(n)≠0
【单选题】If both the marginal cost and the average variable cost curves are U-shaped, which of the following is true over the range of output for which the average variable cost curve has a negative slope?
A.
The marginal cost curve must have a negative slope.
B.
The average total cost curve must have a negative slope.
C.
The marginal cost curve is below the average variable cost curve.
D.
both (b) and (c) are correct.
【单选题】Which of the following is true if marginal cost is above average variable cost as output rises?
A.
Average total cost must be falling
B.
Average fixed cost must be rising.
C.
Average variable cost must be falling.
D.
Average variable cost must be rising.
【简答题】成束的制帚用高粱
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