系统误差。()抽样误差。()
A.不正确的操作方法造成
D.任何研究中都无法避免的
C.测定仪器的原因造成
D.选择调查的对象不正确
E.被调查者不回答问题
参考答案:C,B
— Were you told to attend the meeting? I didn't see you anyway.
— ________, but I had an accident on the way. [ ]
A. I was going
B. I would
C. I should have
D. I'd like to
手机支付业务网站的地址为:()。