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【多选题】
在电路使用时,PN结反向应用的特殊二极管有( )A.
发光二极管
B.
光电二极管
C.
稳压二极管
D.
变容二极管
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举一反三
【单选题】Only after I had known him for some time______to appreciate his real worth.
A.
do I begin
B.
did I begin
C.
I began
D.
had I begun
【单选题】______I’d have told you. [ ]
A.
If I would have known it
B.
Had I known it
C.
If I had have known it
D.
should I know it
【单选题】选择正确的处理步骤:( ) 当检索返回的网页较少或着没有匹配的信息时,可按照下面方法进一步处理: 1换一种搜索工具试一下,每种搜索工具的检索方式和所拥有资料的侧重点不同。 2检查关键词的拼写是否有误,关键词组合是否有自相矛盾的地方。 3将用某些关键词用更常见的同义词替代后重新进行搜索。
A.
①②③
B.
②③①
C.
③②①
D.
③①②
【单选题】If I ____ more about diamond, I ____ cheated by that man.
A.
had known, would not be
B.
had known; wouldn’t have been
C.
knew; would not have been
D.
had known; would never be
【单选题】______, I'd have told you. [ ]
A.
If I would have known it
B.
If I had have known it
C.
Had I known it
D.
Should I know it
【单选题】选择正确的处理步骤：( )当检索返回的网页较少或着没有匹配的信息时，可按照下面方法进一步处理：①换一种搜索工具试一下，每种搜索工具的检索方式和所拥有资料的侧重点不同。②检查关键词的拼写是否有误，关键词组合是否有自相矛盾的地方。③将用某些关键词用更常见的同义词替代后重新进行搜索。
A.
①②③
B.
②③①
C.
③②①
D.
③①②
【单选题】Only when I put myself in their position ________ they were more miserable than me.
A.
I had known
B.
had I known
C.
I knew
D.
did I know
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