对于CP1E系列PLC，当执行数据传送指令MOV（21）时，将常数#3，送到100通道后，PLC的输出点（ ）会得电输出。

单项选择题Whatever is made and offered for sale is called supply. The demand for a product or service always affects the ______ of that product or service.

不定项选择芽孢是一部分细菌用于休眠，抗逆的特殊结构（ ）。