Kết quả tìm kiếm

$Al + NaNO_3 + NaOH + H_2O \rightarrow NaAlO_2 + NH_3 + H_2$

Chỉ giúp mình cách cân bằng oxi hóa - khử phương trình hóa học: $Zn + HNO_3 \rightarrow Zn(NO_3)_2 + N_2O + NO + NH_4NO_3 + H_2O$

The more polluted air we breathe, ........................ we get A. the more weaker B. the more weak C. the weaker D. weaker more

1. I was surprised at his reaction ................ what I said A. to B. between C. about D. on 2. The bus was late this morning , which is unusual. It's usually ................. time A. in B. on C. with D. among 3. When the train arrived at Bristol, passengers in turn got .................. it...

1. Sorry I haven't written ................. you for such a long time. A. with B. against C. from D. to 2. There was an accident this morning. A bus collided ............... a car A. from B. with C. onto D. at 3. In the dark, I bumped .................. the chair A. into B. about C. down D...

Các phân tử đều có liên kết $ion$ là: A. $NaHS,K_2S,Na_2SO3,H_2SO_4,SO_3$ B. $Na_2SO_3,K_2S,Na_2SO_4$ C. $Na_2SO_3,K_2S,H_2S,NaHS$ D. $H_2S,K_2S,NaHS,Na_2SO3$ Summon chị @Hy Nhiên

next month trong câu gián tiếp đổi thành gì ?

"I'll never make that mistake again". Robert said => Robert promised __________ that mistake again. A.no making B.not made C.never to make D.never made

Cho mình hỏi những động từ có cấu trúc như sau: V + O + bare infinitive

Khi nào thì dùng Like + to infinitive và Like + Ving ?

Mother's Day is the day when children show their love to their mother on

1.Monday is the day. We will come then -> 2.Maria is studying in New York City. The City is called the "Big Apple" ->

Justine, _________ parents live in Christchurch, has gone to Southampton A.whom B.which C.to whom D.whose

Mọi người cho mình hỏi về cách phân biệt which và when , which và where trong mệnh đề quan hệ ?

I had the operator to put the call through for me ->

Gọi $F$ là giao điểm của $AM$ và $(O)$. Kẻ $AH \perp CO$ $CH.CO=CD.CE=AC^2 \Rightarrow OHDE$ nội tiếp $\Rightarrow \angle MHD = \angle OED$ Vì $MDHA$ nội tiếp $\Rightarrow \angle MHD = \angle MAD = \angle FAD$ $\Rightarrow \angle FAD = \angle OED$ $\Rightarrow E,O,F$ thẳng hàng $\Rightarrow...

Hẹn ngày gặp lại HMF :(

Bài 2. $\angle PEF + \angle PMB = \angle PAB + \angle PMB = 180^{\circ} \Rightarrow \angle PEF = \angle PAB$ $\angle PEF + \angle PFE = \angle PAB + \angle PBA \Rightarrow \angle PFE = \angle PBA$ $MF.MB=MC^2=MP.MN \Rightarrow$ Tứ giác $PFBN$ nội tiếp $\Rightarrow \angle PFN = \angle PBA$...

But for the hold-up, we ______ here in time A.would have been B.could be C.had been D.must have been Chọn đáp án đúng ? Giải thích ?