设 a , b ∈R,定义运算“∧”和“∨”如下: a ∧ b = a ∨ b = 若正数 a , b , c , d 满足 ab ≥4, c + d ≤4,则( )
A.
a ∧ b ≥2, c ∧ d ≤2
B.
a ∧ b ≥2, c ∨ d ≥2
C.
a ∨ b ≥2, c ∧ d ≤2
D.
a ∨ b ≥2, c ∨ d ≥2
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【单选题】听力原文: Today I bought a copy of China Daily. This is the first time I have bought an English language newspaper. I know I can only understand a little part of it. I bought it out of curiosity. My teach...
【单选题】听力原文: Today I bought a copy of China Daily. This is the first time I have bought an English language newspaper. I know I can only understand a little part of it. I bought it out of curiosity. My teach...