No conclusion  _______  about the new product until the result of the experiment has been announced.

A．will be drawn

B．was drawn

C．has been drawn

D．is drawn

（）的作用是把现场各种开关信号变成可编程序控制器内部处理的标准信号

A、模拟量输入单元

B、智能输入输出单元

C、开关量输出模块

D、开关量输入模块