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【单选题】
下述哪种是β1 受体的主要效应A.
舒张支气管平滑肌
B.
加强心肌收缩
C.
骨骼肌收缩
D.
胃肠平滑肌收缩20
E.
腺体分泌
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反馈参考答案：
举一反三
【简答题】接触器选用时,主触点的额定工作电流应 或_ 负载电路的电流,吸引线圈的额定电压应与控制回路 。
【单选题】By the year 2000, today's______ nations will have a total population of 5 billion people, nearly four-fifths of the world's population.
A.
biggest
B.
Asian
C.
developing
D.
developed
【单选题】—______ is the population of China today? —It's about one billion, three hundred million. [ ]
A.
How many
B.
How much
C.
What
【简答题】Today there are 6.4 billion people on the earth. By the year 2050 there may be 12.5 billion . There are a lot of people to feed. We need more and more food. One way to produce more food is growing st...
【单选题】China today is home to 13 billion people--nearly one quarter of the world's population. The growth of China's population is largely the result of modernization, which has brought with it more food, be...
A.
predict the population problem in China
B.
explain why the family-planning policy is adopted in China
C.
illustrate the result of family-planning policy
D.
demonstrate the cause and effect of the family-planning policy
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