下列哪些汇流条无电时会造成STAND BY POWER OFF（备用电源断开）灯亮（）
After making some network changes you power off and then power on your Cisco router. What sequence of events occurs when a router is powered up?（）
He has never done this type of work before; I am not sure how he will fit（）with it.
hp3030提示：SCANNER ERROR OFF POWER ON POWER是什么地方的问题（）
( ) we are doing has never been done before.
Before he came to London ,he had never heard a single English word (speak)_______.
He talked_________he had never met me before， which made me quite embarrassed．
( ) we are doing has never been done before.
原文:Our great motherland has never before been so prosperous as it today. 译文:我们伟大的祖国从来没有像今天这样繁荣昌盛。
Our great motherland has never before been so prosperous as it today.译文：我们伟大的祖国从来没有像今天这样繁荣昌盛。
All visitors tothe lab(expect) ______ before to take off their shoes before they enter.
Never before he had felt himself sopowerfully attracted to the scientific ideal.
Did you enjoy yourself at the party ---Yes. I’ve never been to ___ one before.
The balloonists are waiting for ________ weather conditions before taking off.
—Why are you staring？—I've never seen______tree before.
—Why are you staring？—I’ve never seen tree before______.
He has been ill with a strange disease lately, ______I’d never heard of before.
Before he came to London, he had never heard a single English word______.
Her refusal to obey him greatly incensed him who has never met that kind of opposition before.
I discovered an addiction to housework which I had never felt before________.
—Did you enjoy yourselft the prty —Yes, I’ve never been to one before. more excitedB．the most—Did you enjoy yourselft the prty —Yes, I’ve never been to\ one before. more excited B．the most excited C． more exciting D．the most exciting
20thcentury saw economic growth that has never been seen before（）
Louln City is nottll__________ trveler who hs never seen the desert before cn expect.th9.Louln City is nottll__________ trveler who hs never seen the desert before cn expect.tht B．wht C．which D．Where
U______: that has never happened, been done or been known before
