在滴定分析中,因为反应进行不完全或干扰离子的影响,以及滴定终点和理论终点不符合等,都会系统地影响测定结果,从而产生的系统误差属于操作误差。
参考答案:错
磁石的药理作用包括()
A.镇静
B.抗惊厥
C.抗炎
D.止血
E.镇痛
Consider a 10 - year annuity that promises to pay out $10000 per year; given this is an ordinary annuity and that an investor can earn 10 percent on her money, the future value of this annuity, at the end of 10 years, would be:()
A. $159374.
B. $175312.
C. $152500.