单项选择题
A.14x17英寸和10x12英寸 B.16x16英寸 C.17x17英寸 D.12x14英寸
A.16x16inch B.14x17inch C.17x17inch D.10x12inch
A.14x17inch B.16x16inch C.10x12inch D.17x17inch
A.±180度 B.±120度 C.±100度 D.±90度
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