引起零点漂移最主要的因素是（）。
A.温度的变化
B.电路元件参数的变化
C.电源电压的变化
D.电路中电流的变化
参考答案：A
( ) our S/C No.2002016 dated January 8, I now in- form you that the goods will be shipped tomorrow.
A．With reference to
B．Refer to
C．With refer to
D．Referred to
化学反应的收率＝转化率/选择性。
