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【单选题】
有如下类和对象的定义： class Constants{ public： static double get PI(){return 3.1416} }； Constants constants； 下列各组语句中，能输出3.1416的是A.
cout＜＜constants-＞getPI()和cout＜＜Constants::getPI()；
B.
cout＜＜constants. getPI()和cout＜＜Constants．getPI()；
C.
cout＜＜constants-＞getPI()和cout＜＜Constants-＞getPl()；
D.
cout＜＜constants. getPI()和cout＜＜Constants::getPI()；
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【单选题】一定流量的液体在一φ33.5×3.25mm的直管内作湍流流动,其对流传热系数α=1000W/m 2 .°C。如流量与物性都不变,改用一φ19×2mm的直管,则其α值将变为________________W/m 2 .°C。
A.
1125
B.
1600
C.
2881
D.
889
【简答题】Please paraphrase the following sentence. (Para.19) That was the signal for a general rising all along the little valley.
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A.
make up for
B.
get along with
C.
keep up with
D.
put up with
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A.
She hasn't seen her friend for years.
B.
She worries about her friend's health.
C.
She worries her daughter's health.
D.
She worries about her daughter's study
【单选题】一定流量的液体在一φ33.5×3.25mm的直管内作湍流流动,其对流传热系数α=1000W/m 2 .°C。如流量与物性都不变,改用一φ19×2mm的直管,则其α值将变为________________W/m 2 .°C。
A.
1125
B.
1600
C.
2881
D.
889
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