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【单选题】
下列哪种胃肠道消化酶不是以无活性的酶原方式分泌的A.
核糖核酸酶
B.
胰蛋白酶
C.
蛋白酶
D.
羟基肽酶
E.
胃蛋白酶
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反馈参考答案：
举一反三
【单选题】A constant output voltage from an AC generator is maintained by the _____.
A.
prime mover governor
B.
exciter generator
C.
voltage regulator
D.
reverse power relay
【单选题】Total revenue increases at a constant rate as output increases when average revenue:
A.
increases as output increases.
B.
increases and then decreases as output increases.
C.
exceeds price.
D.
is constant.
【单选题】Assuming fixed costs are positive, over a range of output in which average total costs were constant,
A.
average variable costs would be constant as output increases.
B.
average variable costs would be falling as output increases.
C.
average variable costs would be rising as output increases.
D.
marginal cost would be less than average variable cost.
【简答题】宋明理学的代表人物有（）（）（）（）（）。
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