【多选题】【消耗次数：1】
下列属于访客对讲系统应该考虑的问题的是（ ）。
①
要求对讲语言清晰，信噪比低，失真度低
②
只要按下户主代码，对应的户主拿下话机就可以与访客通话
③
访客对讲系统的线制结构有多线制和总线制两种
④
防盗门可以是栅栏式或复合式，但关键是安全性和可靠性要有保证
⑤
可视对讲系统可用于单元式的公寓和经济条件比较富裕的家庭
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相关题目
【多选题】
下列属于访客对讲系统应该考虑的问题的是（ ）。
①
要求对讲语言清晰，信噪比低，失真度低
②
只要按下户主代码，对应的户主拿下话机就可以与访客通话
③
访客对讲系统的线制结构有多线制和总线制两种
④
防盗门可以是栅栏式或复合式，但关键是安全性和可靠性要有保证
⑤
可视对讲系统可用于单元式的公寓和经济条件比较富裕的家庭
随机题目
【单选题】
Not until he went through real hardship the love we have for our families is important.
①
had he realized
②
did he realize
③
he realized
④
he had realized
【单选题】
—I knocked over my coffee cup. It went right over _____ keyboard.—You shouldn’t put drinks near _____ computer.
①
the; /
②
the; a
③
a; /
④
a; a
【单选题】
The letters for the boss __________ on his desk but he didnt read them until three days later.
①
were put
②
was put
③
put
④
has put
【单选题】
Someone called me up in the middle of the night, but they hung up _____ I could answer the phone.
①
as
②
since
③
until
④
before
【单选题】
Is the hotel _____ offered you a job _____ you stayed the first time you arrived here?
①
which; where
②
the one; in which
③
where; that
④
the one that; which
【单选题】
—Have you heard about that fire in the market?—Yes, fortunately no one __________.
①
hurt
②
was hurt
③
has hurt
④
had been hurt
【单选题】
When I get to the top of the building, the sun [填空].
①
shine
②
shines
③
is shining
④
was shining