Chọn những thiết bị áp dụng sự phóng điện trong không khí

A. Đèn hình tivi

B. Bugi trong động cơ nổ

C. Đèn cao áp

D. Đèn sợi đốt

Bằng phương pháp hoá học nào có thể Xác định được có khí clo lẫn trong khí hiđro clorua ?

Viết PTHH của các phản ứng xảy ra.

Mark the letter A, B, C, or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.

Peter: “……………………………………”

Tim: “What happened?”

A. What did you do to day?

B. I had a bad day.

C. How was your day?

D. Have a nice day.

Đốt cháy hoàn toàn m gam một triglixerit X cần vừa đủ 0,77 mol O₂, sinh ra 0,5 mol H₂O. Nếu thủy phân hoàn toàn m gam X trong dung dịch KOH đun nóng thu được dung dịch chứa 9,32 gam muối. Mặt khác, a mol X làm mất màu vừa đủ 0,06 mol brom trong dung dịch. Giá trị của a là

A. 0,02

B. 0,01

C. 0,03.

D. 0,012

Quan sát các đồ thị trong hình và rút ra mối liện hệ về dấu của giá trị f(x) = ax2 + bx + c ứng với x tùy theo dấu của biệt thức Δ = b2 – 4ac.

Maria: "Thanks for the lovely present."

Diana: "______."

A. It was the least we could do

B. No worry. A present is coming

C. Yes, it’s really a lovely present

D. Why do you have to say so?

Read the passage and choose the best answer among A, B, C, or D

        When you apply for a job, one of the most important things is job interview. In order to make a good impression during a job interview, you need to prepare yourself for the interview carefully. Punctuation is very necessary. You should arrive in plenty of time so that you have a little of time to relax and keep calm before the interview. You should be well—dressed. Do not wear a skirt which is too short or jeans. You also need to plan what you are going to say. You have to answer a lot of questions about your education and experience. You may be asked many things about yourself and especially about the reason why you decide to apply for the job. You can ask the interviewer about the salary you expect, the position you are applying and the duties you have to do in the job. You also must try to find out as much as possible about the company you want to work for.

You can ask the interviewer about_______

A. the salary, position and duties

B. the reason why you are interested in the job

C. the salary and the interviewer's education

D. the salary, the interviewer's family and his duties

When you have a small child in the house, you_________leave small objects lying around. Such_________objects be swallowed, causing serious injury or even death.

A. needn't / may

B. should not / might 

C. mustn't / can't

D. should / must

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
I’d rather you ______the kids drop bits of pizza all over my new sofa.

A. won’t let

B. didn’t let

C. don’t let

D. aren’t letting

Số trieste khi thủy phân đều thu được sản phẩm gồm glixerol, axit CH₃COOH và axit C₂H₅COOH là

A. 4.

B. 9

C. 6.

D. 2.