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48) Vật trong chân không luôn chuyển động với gia tốc 9,8 m/s2; nước ở áp suất 1 atmôtphe luôn sôi ở 100oC. Điều này chứng tỏ...a) Giữa nguyên nhân và kết quả có mối quan hệ sản sinhb) Nguyên nhân luôn có trước kết quảc) Một nguyên nhân nhất định, trong những hoàn cảnh giống nhau, sẽ tạo nên những kết quảgiống nhaud) Không chứng tỏ được điều gì
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