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【简答题】
使用八选一的的数据选择器 74LS151 来实现下列函数: Y=AB+AC+BC
拍照语音搜题，微信中搜索"皮皮学"使用
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】You _____ cross the road when the traffic lights are red. It's dangerous. [ ]
A.
needn't
B.
may not
C.
mustn't
【单选题】You should be __________ when you cross the street.
A.
quiet
B.
easy
C.
careful
D.
hard
【单选题】You ______ cross the road when the traffic lights are red. It’s dangerous. A. n
A.
You ______ cross the road when the traffic lights are red. It’s dangerous. A. needn’t
B.
may not
C.
mustn’t
【单选题】You _____ be careful when you cross here --- the traffic lights aren’t working.
A.
could
B.
might
C.
ought to
D.
may
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