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No one knows ______effects the GM material might have on the food chain
1年前
过直线{10x+2y-2z=27,x+y-z=0},做曲面3x*x+y*y-z*z=27的切平面,求此切平面方程
1年前
The rain started an hour ago. It's still raining now. It________for one hour.
1年前
他把一生都献给了帮助穷人的事业。(devote oneself to doing sth)
1年前
如果不等式4x-3a>-1与不等式2(x-1)+3>5的解集相同,请确定a的值.
1年前