在电位滴定中,若以作图法(E为电位、V为滴定剂体积)确定滴定终点,则滴定终点为()。
A、E-V曲线的最低点
B、曲线上极大值点
C、为负值的点
D、E-V曲线最高点
参考答案:C
When asked why he went there, he said he was sent there for a space flight. [ ]
A. training
B. being trained
C. to have trained
D. to be trained
对于有抗冻要求的混凝土用砂,其泥块含量不应大于2.0%。