giai giup e câu 12 13 14 15

giúp e với 

1 trong động cơ 4 kỳ trục cam quay 1 vòng thì trục khủy quay bao nhiêu vòng

giup e voi 

1 bugi của động cơ xăng bắt đầu bật tia lửa điện ở 

giúp e 

1 hirocacbon nào sau đây khi phản ứng với dung dịch brom thu được 2,3-đibrombutan

giup e vs mn

1 mach dien co dien tro ngoai bang 5 lan dien tro trong . khi xay ra hien tuong doan mach thi ti so giua hieu dien the mach ngoai va suat dien dong cua nguon bang 

A  5    B 2     C 0  D  vo cuc

complete each sentence using 'one , some , it or them , chi ra dau hieu nhan biet

4 I'm afraid the vase broke . I dropped ... on the floor 

5 I'm having a biscuit . would you like ...too?

6 I don't have any good CDs , but my brother has....

7 have you seen my glasses ? I put .. on  the desk a minute ago

8 I've been looking for a pencil , but I haven't found ...

9 There's a lot of milk in the fidge. you can get... if you like 

10 these painting are beautiful. can you hang ..all on the wall?

complete each sentence using one , some , it or them

1 If you need a map, I can lend you 

2 if you need the money , i can lend you ...

3 we took a taxi . there was .. waiting

giup e lam  dung one or ones 

1 put these large boxes here , and those small .......over there !

2 ' which of those girls is your sister ? - 'She's the ...... with the dark hair '

3 there are two films on TV this evening . which ...would you prefer to see ?

4 My new glasses are muc strong than my old ......

5 'would you like a drink ?' 'oh ,yes.please , I'd love ....'

giup e 

1) 2 qua cau kim loai kich thuoc giong nhau mang dien tich lan luot q1 q2 cho chung tiep xuc nhau roi tach ra thi moi qua cau mang dien tich :

A q=q1+q2     B q= q1 -q2   C q=q1+q2 /2     d q=q1-q2/2 

2) Cho dien tich dich chuyen giua 2 diem co dnh trong 1 dien truong deu voi cuong do 150V/m thi cong cua luc dien truong 60mj . Neu cuong do dien truong la 200V/m thi cong cua luc dien truong dich chuyen dien tich giua 2 diem do la

A 80j   B 40j   C 40mj   D 80mj 

giup e cau

1 .neu hieu dien the giu hai tam kim loai phang dat song song voi nhau tang 2 lan con khoang cach giua 2 tam giam 2 lan thi cuong do dien truong trong 2 tam se a

a tang 2 lan     b giam 2 lan    c tang 4lan    d giam 4 lan