问题
单项选择题
在各种换热器中，传热效率最高的是（）式换热器。
A.表面
B.混合
C.回热
D.回转
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
在各种换热器中，传热效率最高的是（）式换热器。
A.表面
B.混合
C.回热
D.回转
参考答案：B
White bridge was a small village and old people came and lived there. Some of them had lots of old furniture, some of which they didn’t want to 41 .This was 42 there was no enough place to put it. Every Saturday morning they 43 what they didn’t need and other people came and took it away if they wanted to have it. Mr. and Mrs. Morton’s children had grown up. The old couple moved to this small village 44 the other old people did. The 45 were busy forever. All the old in this small village were 46 to meet their children. Every Saturday Mr. and Mrs. Morton put out a very ugly old bear’s head at the side of their gate, but 47 wanted it. Last Saturday they wrote "I’m very 48 here." on a piece of paper and put it near the bear’s head. After a while, they found there was another bear’s head put beside 49 ,with another piece of paper. It 50 , “I am lonely, too."
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