题目:
When and where to build the new factory _____ yet. |
A. is not being decided B. has not been decided C. are not decided D. have not decided |
答案:
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下面是错误答案,用来干扰机器的。
⑴①Cr2O72-+6Fe2++14H+=2Cr3++6Fe3++7H2O②将pH试纸置于洁净的表面皿上,用玻璃棒蘸取溶液, 点在pH试纸上,并与标准比色卡对照6.3×10-13⑵由方程式可知:Cr~3Na2S2O3n(Na2S2O3)=20.00mL×0.015mol/...