2.____The fast food restaurant is in the shopping mall.
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3.____Joyce and Dan order the same drink.
A. 对
B. 错
4.____Dan’s food costs more than that of Joyce.
A. 对
B. 错
PLC上电后,自动接通一个扫描周期的特殊辅助继电器是:
A. M8000
B. M8001
C. M8002
D. M8003
输入继电器必须由外部输入信号来驱动。
A. 对
B. 错