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(1分)I'm doing my homework.Could you please   the TV a little?(  )A.turn up B.turns up C.turn down ...

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doing ; doing    to do ; to do    to do ; do    do ; doing  
must  would  should  might  
is doing my homework    am doing my homework    is doing our homework    are doing our homework  
did my homework    am doing my homework    do my homework    was doing my homework  
is doing;came  was doing;come   was doing;came  am going;comes  
has much to do with the operation of the engine and its life  have much to do with the operation of the engine and its life  has much doing with the operation of the engine and its life  have much doing with the operation of the engine and its life  
交流电Im =1 . 41 4Id  单相半波整流电Im =π Id/2  单相全波整流电Im =π Id  三相全波整流电Im =π Id/3  
11Im1-3Im2= 5  11Im1+3Im2=5  11Im1+3Im2=-5  11Im1-3Im2=-5  

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