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下列属光源的是 [ ] A.干电池 B.月亮 C.蜡烛 D.太阳
1年前
Now he is ___ artist. 1 have known him since he was ___ one-year-old boy.
1年前
We will have no water to drink _________ we don’t protect the earth.
1年前
He ______ would do great thins should not attempt them all alone. [ ]
1年前
一个圆柱体木料,如果截成两段,它的表面积增加25.12平方厘米,如果沿着直径劈成两个半圆柱体,它的表面积 将增加120平方厘米,求原圆柱体的面积.(π取3.14)
1年前