设随机变量X与Y服从正态分布,X~N(μ,42),Y~N(μ,52),记p1=PX≤μ-4),p2=Y≥μ+5,则______.
A. 对任何μ,都有p1=p2
B. 对任何实数μ,都有p1<p2
C. 只对μ的个别值,才有p1=p2
D. 对任何实数μ,都有p1>p2
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A ______ is a formal or official agreement made between persons, groups, institutions or states.
A. contract
B. contact
C. contrast
D. contest
A heavily populated agricultural area is one where ______.
A. there are more factories than farms
B. only a few farmers live
C. too many farmers live close to one another
D. people suffer and starve
If you had ______ the doctor's advice, you would have recovered already.
A. followed
B. listened
C. heard
D. made
The most successful attempts, however, to put on a highly cultured air have been made on long words and expressions.
A. 然而,他成功地摆出了一副很有教养的样子。
B. 然而,为装出一副很有教养的样子的最大努力就是一口气说出所有的话。
C. 然而,要想制造出一副很有教养的氛围,最成功的努力就是用长句和冗长的表达法。
D. 然而,要想摆出一副很有教养的样子,最成功的努力就是用长句和冗长的表达法。