(本小题14分) 已知某种稀有矿石的价值(单位:元)与其重量(单位:克)的平方成正比,且克该种矿石的价值为元。 ⑴写出(单位:元)关于(单位:克)的函数关系式; ⑵若把一块该种矿石切割成重量比为的两块矿石,求价值损失的百分率; ⑶把一块该种矿石切割成两块矿石时,切割的重量比为多少时,价值损失的百分率最大。 (注:价值损失的百分率;在切割过程中的重量损耗忽略不计)(1)Only when your identity has been checked, ________.
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A.you are allowed in
B.you will be allowed in
C.will you allow in
D.will you be allowed in
(2)Only ________ to the zoo with the students who had won prizes.
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A.he wentB.did he go
C.did he wentD.he goes