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①空气中含有足够的水汽 ②气温下降到水汽能够凝结起来的程度 ③湿热空气沿小坡爬升 ④冷空气与暖空气相遇
干球温度
-50 ℃
0.0 ℃
5.0 ℃
10.0 ℃
15.0 ℃
20.0 ℃
25.0 ℃
30.0 ℃
35.0 ℃
干
湿
差
1.0 ℃
77%
82%
86%
88%
90%
91%
92%
93%
2.0 ℃
54%
65%
71%
76%
80%
83%
87%
3.0 ℃
32%
47%
58%
70%
74%
79%
81%
4.0 ℃
11%
31%
45%
61%
66%
68%
73%
75%
15%
44%
52%
56%
67%
69%
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