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A.3
B.4
C.6
D.8
参考答案:D
It was all my ______ that my son had made such a silly but serious _______. [ ]
A. fault; error
B. mistake; fault
C. shortcoming; mistake
D. fault; mistake
与空间定位无关的技术是()
A.Gx
B.Gy
C.Gz
D.B0
E.傅立叶变换