题目内容

A large publicly held company refines crude oil into gasoline and sells gasoline wholesale with long-term contracts at fixed prices. The firm also owns the land, with full rights, from which it pumps crude oil. The firm financed the purchase of the land by issuing floating-rate bonds. This firm could reduce the volatility of its earnings by entering into a(n):I Interest-rate swapII Oil commodity swap

A. I only
B. II only
C. Both I and II
D. Neither I nor II

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( )下列语句是命题的为________。①火星上有生物。②今晚的月亮真圆啊!③地球外的星球上也有人。④立正!⑤不存在最大的整数。⑥明天去游泳吗?⑦9+8>14 ⑧ x+y<9 ⑨所有素数都是奇数。

A. ①②⑤⑦
B. ③④⑧⑨
C. ①⑤⑦⑨
D. ③⑤⑥⑨

( )下述命题公式中,不是重言式的为_________。

A. (p∧q)→(p∨q)
B. (p→(q→r))→((p→q)→(p→r))
C. ┐(p→q)∧q
D. (┐p∨q)∨(q→p)

( )命题公式(┐p⋁q)∧(┐r→q)的主合取范式中含极大项的个数为______。

A. 2
B. 3
C. 5
D. 8

( )命题公式┐(p∧q)→r的主析取范式中含极小项的个数为______。

A. 2
B. 3
C. 5
D. 8