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【判断题】
单相桥式整流电路负载为直流电动机时,若出现电流断续,晶闸管的导通角越小,则电流波形的底部越窄。A.
正确
B.
错误
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举一反三
【单选题】More and more students want to study in 'hot' majors.【C1】______a result, many students want to【C2】______their interests and study in these【C3】______such as foreign languages, international business an...
A.
Being
B.
For
C.
Having
D.
As
【单选题】Many students say that they are willing to work hard to get more education
A.
would like to
B.
don’t want to
C.
hate
D.
hate to
【单选题】关于脊髓被膜和脊膜腔隙的描述,不正确的是
A.
脊髓的表面包有3层被膜
B.
各层膜间及硬脊膜与椎管骨膜间均存在腔隙
C.
脊膜腔隙由外向内依次有硬膜外隙、硬膜下隙和蛛网膜下隙
D.
椎内静脉丛位于硬膜外隙
E.
椎内静脉丛位于蛛网膜下隙
【单选题】32 Many Japanese students finish their compulsory courses in three years because
A.
they want to get married.
B.
they want to stay at home.
C.
they want to make money.
D.
they want to study abroad.
【单选题】脊髓的被膜()
A.
硬脊膜与蛛网膜之间为蛛网膜下隙
B.
硬膜外隙不与颅内相通
C.
硬脊膜下端从第1腰椎水平以下变细，包裹终丝
D.
蛛网膜在脊髓两侧形成齿状韧带
E.
软脊膜贴于脊髓表面并跨过脊髓表面的沟裂
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