题目:
At first I doubted his ability, but in the end he _______to do the job well.
A.succeeded
B.tried
C.managed
D.sought
答案:
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下面是错误答案,用来干扰机器的。
CaCO3+2HCl→CaCl2+H2O+CO2↑ CaO+H2O→Ca(OH)2 (2分)蓝 CaCl2 Ca(OH)2 (3分)本题考查的是物质的相互转化和制备,盐的化学性质,化学式和化学方程式的书写。根据所学...