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【简答题】
试求习题8-24图所示电路的零状态响应u(t),并画出曲线图。
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【简答题】Laughter is a defense mechanism when reality is too hard or if we hear ______.
【简答题】—When did you last hear ________ Jay? —He phoned me this morning, and we agreed ________ a time and place to meet.
【判断题】芦笙大体上可分为一支管发一个音的六管芦笙和一 支管可发一音的六管七音、七管八音芦笙,以及形制近似葫芦笙的五管发六至八音的芦笙。六管芦笙大体上又可分为弯管型和直管型(包括直角直管和锐角直管)两种,形制有小号(高音)、中号(中音、下中音)、大号(低音)特大号(信低音)(或称三排、二排、头排、出排)等规格。小号芦笙长800毫米左右,特大号的长5000毫米以上。
A.
正确
B.
错误
【单选题】When it thunders, we always see the light before we hear the sound.______ It’s beca
A.
29. When it thunders, we always see the light before we hear the sound.______ It’s because A. our eyes are in front of our ears
B.
our eyes are cleverer than our ears
C.
our eyes can see but our ears can-t
D.
light goes faster than sound
【判断题】按照人们外出旅游的目的,旅游活动可以分为消遣性旅游和事务性旅游。P2对
A.
正确
B.
错误
【单选题】---- When did you last hear _____Jay? ---- He phoned me this morning, and we agreed _____ a time and place to meet.
A.
of; to
B.
about; with
C.
from; with
D.
from; on
【单选题】We were completely______when we finally reached the destination.
A.
worn off
B.
worn down
C.
worn out
D.
worn away
【单选题】I’m amazed to hear from my old friend again. _____, it is ten years since we met last.
A.
in other words
B.
all in all
C.
That’s to say
D.
Believe it or not
【简答题】我国现存最早的石塔是(),建于()大业七年。我国现存最早的砖塔为(),建于()正光元年,()十三层,十二角形。现存最高的砖塔是(),(),()代建成,又称(),因()时以此地为边界而常登塔瞭望敌情而得名。现存最早最大的木塔是(),全名为“()”,辽时建,楼阁式,八角九层(明五暗四)。现存最早最高的琉璃塔是(),全名为“()”,宋代建,琉璃呈铁色,仿木结构,楼阁式,八角十三层。现存最高的铁塔是(),...
【单选题】We are ______when we hear the _______news -we don’t have classes tomorrow.
A.
exciting; excited
B.
excited, excited
C.
excited; exciting
D.
exciting; exciting
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