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【单选题】
According to Paragraph 4, what is the function of the Jacobson's organ in snakes?A.
To assist in the search for chemical particles in the air.
B.
To enable the tongue's fork to be spread more widely.
C.
To utilize the snake's trained sense of direction.
D.
To compare the sensory input of the two tongue tips.
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【单选题】若换热器的换热管为金属材料,当管壁很薄时,间壁两侧流体的对流传热膜系数相差悬殊,则要求提高传热系数以加快传热速率时,必须设法提高 ( ) 的膜系数才能见效。
A.
最小
B.
最大
C.
两侧
D.
不确定
【单选题】When invited out for 'supper' a few weeks later, the writer______.
A.
expected to be served a proper dinner
B.
arrived on the wrong evening
C.
interpreted the invitation correctly this time
D.
realized there was no dinning-room in the cottage
【简答题】当间壁两侧冷，热流体的对流传热膜系数α相差很大时，传热系数接近于（）一侧的α值。
【简答题】宏程序中的 #110 属于 _______ 变量 .
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