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【简答题】
饮水消毒的主要目的是（ ）。
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】设置 LED 灯亮语句( )。
A.
digitalWrite(LED,LOW)
B.
digitalRead(LED,HIGH)
C.
digitalWrite(LED,HIGH)
D.
digitalRead(LED,LOW)
【简答题】It helps people go to the top of house.
【单选题】－The train is leaving right now, but David hasn't arrived yet. －Well, he said he here on time. [ ]
A.
came
B.
will be C．would come D. can be
【单选题】—The train is leaving right now, but David hasn't arrived yet. —Well, he said he ____ here on time. [ ]
A.
came
B.
will be
C.
would come
D.
can be
【简答题】红色叉形灯或者箭头灯亮时表示什么?
【单选题】-The train is leaving right now, but Tom hasn't arrived yet. -Well, he said he ______ here on time. [ ]
A.
would come
B.
will come
C.
will be
【简答题】S7-300PLC CPU的led指示灯中SF亮表示____,BF灯亮表示____。
【简答题】STELA板上有四组表示轨道电路状态的LED灯：P灯、S灯、R灯。其中（）亮表示对应的轨道电路未被占用，（）亮表示发送报文，（）亮表示读取报文。
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