答案：
1-5 ABDAC 6-10 ABCAD
11-12 BA
13 engine
14 private
15 medium
16 climate
17 fuels
18 corporate
19-23 ABCAA 24-28 ABACA 29-33 BABAA
34-38 ADACB 39-43 AACAB 44-48 AADAD
49-53 ABAAD
54-58 DACBA 59-63 ADBAA 64-68 ABCAD
69-73 DABCA
74 1-0-2-1.5-0.5 75 0.5-1-0-2-1.5 76 0-0.5-1-2-1.5
77 0-0.5-1-1.5-2 78 1-1.5-2-0.5-0
