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【简答题】
用万用表测得某二极管正反向电阻相差很大,表明二极管 ,所测电阻较小时,与黑表笔相接的是二极管的 极,若测二极管正反向电阻值都很小或为零,表明该二极管 ,若正反向电阻值都很大,则表明该二极管 。
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【简答题】To acknowledge other cultures will _____ good will among people of different backgrounds.
【单选题】To acknowledge other cultures will ___________ good will among people of different backgrounds.
A.
compel
B.
accelerate
C.
promote
D.
change
【简答题】To acknowledge other cultures will among people of different background. 承认别人的文化会促进不同背景的人之间的友好亲善。
【单选题】To acknowledge other cultures will _____ good will among people of different backgrounds.
A.
revise
B.
prune
C.
promote
D.
revolve
【简答题】To acknowledge other cultures will _____ (支持;鼓励;提倡)good will among people of different backgrounds.
【简答题】下列烯类单体适于何种机理聚合?自由基聚合、阳离子聚合还是阴离子聚合?并说明原因。 CH 2 =CHCl CH 2 =CCl 2 CH 2 =CHCN CH 2 =C(CN) 2 CH 2 =CHCH 3 CH 2 =C(CH 3 ) 2 CH 2 =CHC 6 H 5 CF 2 =CF 2 CH 2 =C(CN)COOR CH 2 =C(CH 3 )-CH=CH 2
【简答题】下列烯类单体适于何种机理聚合?自由基聚合、阳离子聚合还是阴离子聚合?并说明原因。 CH 2 =CHCl CH 2 =CCl 2 CH 2 =CHCN CH 2 =C(CN) 2 CH 2 =CHCH 3 CH 2 =C(CH 3 ) 2 CH 2 =CHC 6 H 5 CF 2 =CF 2 CH 2 =C(CN)COOR CH 2 =C(CH 3 )-CH=CH 2
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