LED light bar 是什么?LED light bar with sensor 中的sensor 是什么?

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• LED light bar 是什么?LED light bar with sensor 中的sensor 是什么?
• LED light bar 是什么?LED light bar with sensor 中的sensor 是什么?
• light sensor
• ENGLISH PROBLEMS1.This is the house _____ we used to sleep.A.where B.that C.which2.He said _____ the man _____ had robbed the bank had long hair.A.who;who B.that;that C.that;which3.That's the Museum _______ we visited last year.A.where B.which答案选B,为什么?