71.[答案] A
[解析] 参见教材P56
72.[答案] A
[解析] 参见教材P55
73.[答案] A
[解析] GA=GY-αGL-βGk=4%-0.8×2%-0.2×2%=2%
74.[答案] B
[解析] 参见教材P57
75.[答案] C
[解析] 参见教材P57
76.[答案] A
[解析] 参见教材P57
77.[答案] A
[解析] 参见教材P58
78.[答案] D
[解析] 参见教材P59
79.[答案] C
[解析] 参见教材P59
80.[答案] A
[解析] 参见教材P60
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