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【单选题】
有关黑洞的事件视界,下列描述错误的是?A.
视线的边界
B.
黑洞物质的边界
C.
光线逃逸的边界
D.
黑洞面积的边界
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举一反三
【简答题】Give 1. an extra 2. minutes to make sure you 3. in time.
【简答题】Write a thank-you letter in the name of the author (Total: 5 points) --- Make sure you use the right format for a letter of thanks. (1) --- Make sure you use the right tone for your writing. (1) --- G...
【简答题】Write a thank-you letter to your parents(10 points) --- Make sure you use the right format for a letter of thanks. (2 points) --- Make sure you use the right tone for your writing. (2 points) --- Desc...
【简答题】Watch "Listening to the world" over five times and make sure every sentence make sense to you. 2. Listen to mp3 " Speaking for communication" over five times and make sure every sentence make sen...
【简答题】已知两条直线l 1 ：y=2，l 2 ：y=4，设函数y=3 x 的图象与l 1 、l 2 分别交于点A、B，函数y=5 x 的图象与l 1 、l 2 分别交于点C、D，则直线AB与CD的交点坐标是______．
【简答题】设函数f(x，y)=x 3 -y 3 +3x 2 +3y 3 -9x．
【单选题】Can you make sure ______ the gold ring?
A.
where Alice had put
B.
where did Alice put
C.
where Alice has put
D.
where has Alice put
【简答题】设直线l 1 ：x+my+6=0和l 2 ：（m-2）x+3y+2m=0，当m=______时，l 1 ∥ l 2 ．
【简答题】读下列介绍,填写相应的岗位名称。 waiter cook barman manager ___1____:I
know a lot about beer and wine. I make sure the waitresses get the right drinks
for their guests. ___2____: I make sure everyone
does thei...
【简答题】等面积补强法规定局部补强的金属截面积必须 ( )开孔所减去的壳体截面积,其实质在于补强壳壁的( ) 强度,即用与开孔等截面的外加金属来补偿被削弱的壳壁强度。
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