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【单选题】
六经病证的传变中'并病'是指( )A.
由某一经病证转变为另一经病证
B.
隔一经或两经以上相传者
C.
伤寒病初起不从阳经传入，而病邪直入
D.
伤寒病不经过传变，两三经同时出现的病证
E.
伤寒病凡一经病证未罢，又见他经病证者
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反馈参考答案：
举一反三
【单选题】Constant returns to scale means that, given any constant x > 0
A.
xzF(xK, xN d)= zF(xK, xNd) .
B.
xzF(xK, xN d) > zF(xK, xNd) .
C.
xzF(xK, xN d) < zF(xK, xNd) .
D.
xzF(xK, xN d) = zxF(K, Nd) .
【简答题】规模收益不变（Constant returns to scale）
【单选题】Constant returns to scale indicate that a firm is experiencing:
A.
per unit costs of production that are decreasing as the scale of output expands.
B.
per unit costs of production that remain stable as the scale of output expands.
C.
per unit costs of production that are increasing as the scale of output expands
D.
an increasing marginal product.
【单选题】When a firm experiences constant returns to scale,
A.
long-run average total cost is unchanged, even when output increases.
B.
long-run marginal cost is greater than long-run average total cost.
C.
long-run marginal cost is less than long-run average total cost.
D.
the firm is likely to experience coordination problems.
【简答题】What is Intra-industry trade ? What is Increasing
returns to scale ? What is Decreasing
returns to scale? What is Constant
returns to scale
【单选题】下列命题叙述错误的是( )
A.
矩阵 可逆的充要条件是零不是 的特征值;
B.
数 是 的特征值的充要条件是方程组 有非零解;
C.
若 是方阵 的两个线性无关的特征向量,则它们必是方阵 的对应于不同特征值的特征向量;
D.
在复数范围内, 阶方阵有 个特征值(重根按重数计算).
【单选题】Constant returns to scale indicate that a firm is experiencing:
A.
per unit costs of production that are decreasing as the scale of output expands.
B.
per unit costs of production that do not vary with the scale of output.
C.
per unit costs of production that are increasing as the scale of output expands.
D.
A decreasing marginal product.
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