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下列物体中不属于光源的是: [ ] A.萤火虫 B.点燃的蜡烛 C.点亮的电灯 D.月亮
1年前
We all want to try something new, but finding the _________ to start is always the hardest part.
1年前
After P.E., I often feel very thirsty.
1年前
用链式法则求下列复合函数的偏导数或导数,设z=x/y,x=e^t,y=lnt
1年前
计算: (1)1+2+3+4+5+6+7+8+9+10+11+12; (2)11+12+13+14+15+16+17+18+19.
1年前