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【单选题】
面关于位运算符的叙述,正确的是A.
||表示"按位或"的运算
B.
#表示"按位异或"的运算
C.
&表示"按位与"的运算
D.
~表示"按位异或"的运算
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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)
【单选题】Among his criticisms, which he said _______ an indication of his experience over several months, he includes the train being dirty.
A.
was
B.
were
C.
being
D.
been
【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?
【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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