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43) Có rất nhiều loại nguyên nhân, như: nguyên nhân cơ bản, nguyên nhân chủ yếu, nguyên nhân bên trong, nguyên nhân bên ngoài, nguyên nhân chủ quan, nguyên nhan khách quan...điều đó chứng tỏ là...a) Một kết quả chỉ có thể do một loại nguyên nhân gây rab) Một kết quả có thể do nhiều loại nguyên nhân gây rac) Một kết quả có thể không cần nguyên nhân gây rad) Không thể nhận thức được quan hệ nguyên nhân - kết quả
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