挑战习题
1/5单选题
难度:

1.定积分的值是(    )
A 1
B 2
C 3
D 4
提示1:
IGNvczJ4PTxpbWcgd2lkdGg9MTU4IGhlaWdodD0yMSBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0ZFL0NEL3JCQUNFMU5RMWxyaXlLYjNBQUFDYmF5SVptZzI4OS5wbmciPizmiYDku6U8aW1nIHdpZHRoPTEyMyBoZWlnaHQ9NDQgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9GRS9DRC9yQkFDRTFOUTFscVJ3dmZ6QUFBRkJUaVhRNEE0NzMucG5nIj48aW1nIHdpZHRoPTE1MiBoZWlnaHQ9NDIgc3JjPSJodHRwczovL3AyLnFpbmdndW8uY29tL0cxL00wMC9GRS9DRC9yQkFDRTFOUTFscXhXTHVQQUFBRG5YV3BPX2szODAucG5nIj4=
提示2:
IDxpbWcgd2lkdGg9Mzg4IGhlaWdodD00NCBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwL0ZFL0NEL3JCQUNFMU5RMWxxQTJ2b0hBQUFMRnVwcl9kMDQwOS5wbmciPg==
正确答案:Qg==
6Kej77yaPGltZyB3aWR0aD0zODggaGVpZ2h0PTQ0IHNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvRkUvQ0QvckJBQ0UxTlExbHFBMnZvSEFBQUxGdXByX2QwNDA5LnBuZyI+