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【单选题】
在发动机的四个工作行程中,只有 ( ) 行程是有效行程。A.
压缩
B.
进气
C.
做功
D.
排气
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举一反三
【单选题】Which of the following is the most reasonable cause of euthanasia?
A.
People don't like to live too long.
B.
People don't like to suffer from lasting chronic diseases.
C.
People don't like to be hospitalized.
D.
People don't like to become a burden of others.
【单选题】The total costs of providing the service of transportation consist of fixed costs and（ ）.
A.
variable costs
B.
administrative costs
C.
costs of repairs
D.
costs of crew
【多选题】生物半衰期是指()
A.
吸收一半所需的时间
B.
药效下降一半所需时间
C.
血药浓度下降一半所需时间
D.
体内药量减少一半所需时间
E.
与血浆蛋白结合一半所需时间
【单选题】If marginal costs equal average total costs,
A.
average total costs are falling.
B.
average total costs are rising.
C.
average total costs are maximized.
D.
average total costs are minimized.
【单选题】More and more people don't like to be with smokers in ( )room.
A.
same
B.
some
C.
the same
D.
the some
【简答题】Most people don't want to be too c (显眼的) .
【单选题】Period costs and product costs:
A.
a. appear on the income statement
B.
b. refer to inventory costs
C.
c. are costs of service firms
D.
d. All of these answers are correct.
【单选题】患儿男，9岁，反复呼吸道感染，2岁之内曾患肺炎多次，易感乏力，活动后有气促但无青紫。胸骨左缘第3～4肋间闻及Ⅳ级吹风样收缩期杂音，肺动脉瓣区第二心音较亢进，心尖区闻及短促舒张期杂音。心电图：左、右心室合并肥大。胸部X线片：两肺充血，左、右心室均大，以左心室为显著，肺动脉段突出，主动脉结偏小。最可能的诊断为
A.
房间隔缺损
B.
房间隔缺损合并动脉导管未闭
C.
室间隔缺损
D.
室间隔缺损合并动脉导管未闭
E.
动脉导管未闭
【单选题】生物半衰期是指（）
A.
放射性核素减少一半所需的时间
B.
放射性核素的放射性活度减少一半所需的时间
C.
放射性衰变和生物排出共同作用使放射性活度减少一半所需的时间
D.
放射性核素能量减少一半所需的时间
E.
由于生物排出使生物系统中放射性活度减少一半所需的时间
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