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【单选题】
When a society achieves allocative efficiency, itA.
is not achieving production efficiency.
B.
is producing that combination of goods and services that society values most highly.
C.
might or it might not be producing at a point on societyʹs PPF.
D.
is producing a combination of goods and services whose marginal cost exceeds their marginal benefit.
E.
is producing the combination of goods and services for which marginal benefit exceeds marginal cost by as much as possible.
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A.
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C.
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D.
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A.
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B.
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C.
/; a
D.
the; /
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【简答题】简支梁跨长l受均布荷载q作用,则该梁的最大剪力是 和最大弯矩 。(用q ,l 表示)
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