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【单选题】
不属于收缩血管物质是A.
儿茶酚胺
B.
去甲肾上腺素
C.
激肽
D.
血栓烷A2
E.
血管加压素
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反馈参考答案：
举一反三
【简答题】Strategic alliance may bring negative effects to firms if not properly managed.
【单选题】A monopolistically competitive market
A.
may have too many or too few firms, and the government can intervene to achieve the optimal number of firms.
B.
may have too many or too few firms, but the government can do little to rectify the situation.
C.
usually has too many firms, reducing the economic profit of each firm to zero.
D.
usually has too few firms, reducing the product variety for consumers.
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