实验过程当中，偶然误差、系统误差，用什么方法测量，怎么样去排除，这些方面都应向专业的技术人员咨询，而不应考虑设备本身的精度.
参考答案：错
How many people are directors of both Company K and Company R ？（） (1)There were 17 directors present at a joint meeting of the directors of Company K and Company R, and no directors were absent, (2)Company K has 12 directors and Company R has 8 directors.
A．条件(1)充分，但条件(2)不充分．
B．条件(2)充分，但条件(1)不充分．
C．条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．
D．条件(1)充分，条件(2)也充分．
E．条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
下列药物中最难通过胎盘的是（）
A.阿托品
B.加拉碘铵
C.芬太尼
D.琥珀胆碱
E.巴比妥类药
