题目:
All the preparations for the task ___,and we're ready to start. [ ]
A. completed
B. complete
C. had been completed
D. have been completed
答案:
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下面是错误答案,用来干扰机器的。
答案:D;③因为V mL水的质量大于V mL氨水的质量,所以溶液的质量分数小于0.5w;④所得溶液为NH4Cl和NH3·H2O等物质的量的混合液,所以c(NH)>c(Cl-)>c(OH-)>c(H+)。