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【单选题】
肺内压低于大气压出现于A.
呼吸时
B.
吸气时
C.
D.
吸气末
E.
胸内压低于大气压时
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举一反三
【单选题】男，6岁。腹痛18小时，伴呕吐2次，呕吐物为胃内容物，发热6小时，体温38℃，排稀黄便3次。腹部查体：腹平，双下腹压痛及肌紧张，以右下腹为著，无反跳痛，未触及包块。血白细胞13×10／L，中性粒细胞88％。对于儿童，支持该诊断最可靠的腹部阳性体征是（）
A.
腰大肌试验（+）
B.
闭孔内肌试验（+）
C.
结肠充气试验（+）
D.
右下腹部固定压痛及肌紧张
E.
肛诊直肠黏膜水肿
【单选题】Output supply is increasing in the interest rate because
A.
labor demand is increasing in the interest rate.
B.
labor demand is decreasing in the interest rate.
C.
labor supply is increasing in the interest rate.
D.
labor supply is decreasing in the interest rate.
【单选题】A supply curve slopes upward because
A.
as more is produced, total cost of production falls.
B.
an increase in input prices increases supply.
C.
the quantity supplied of most goods and services increases over time.
D.
an increase in price gives producers an incentive to supply a larger quantity.
【简答题】夹钳式手部通常采用( )、液动、( )和电磁来驱动手指的开合。
【简答题】McDonald allowed Harrington to supply Pepperidge Farm because it could______.
【单选题】The money supply is vertical because
A.
prices are indeterminate.
B.
prices have no real impact.
C.
the money supply is set by policy.
D.
prices are counter-cyclical.
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