毒剧药误差应控制在（）
A.±1%
B.±2%
C.±3%
D.±4%
E.±5%
参考答案：A
He said he didn’t regret telling the truth but felt that he ______ it differently.
A．could have expressed
B．could express
C．must have expressed
D．would express
相对介质损耗因数和电容量比值检测仪器的电流信号应在（）。
A.0.1mA～1mA
B.1mA～1000mA
C.1000mA～2000mA
D.大于2000mA
