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【单选题】
记凸k边形的内角和为f(k)，则f(k＋1)－f(k)＝ ( )A.
B.
π
C.
π
D.
2π
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【单选题】符合朗伯比尔定律的一有色溶液,通过1 cm比色皿,测得透射比为80%,若通过 5cm 的比色皿,其透射比为 ( )。
A.
80.5%
B.
40.0%
C.
32.8%
D.
67.3%
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