Trong phóng xạ $\beta ^ +$ hạt prôtôn biến đổi theo phương trình nào dưới đây?
A.$p \to n + e^ + +
u$.
B.$p \to n + e^ +$.
C.$n \to p + e^ - +
u $.
D.$n \to p + e^ -$.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
The A.I. expert ____ his assistant _____ the newly made robot yesterday.
A.has had / activate
B.had / activate
C.had / to activate
D.has had / activated

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
The man had his new smartphone _______ on the train last week.
A.stealing
B.be stolen
C.stolen
D.to be stolen

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
The computer corporation had their workers _______ malfunctioning products.
A.eliminate
B.to eliminate
C.eliminated
D.eliminating

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
We had the computer technician ________ the new software for us.
A.installing
B.install
C.to install
D.installed

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
The teacher had his students ______ their laptops ______ the Net for resources in his class.
A.used/ access
B.to use/ accessing
C.using/ access
D.use/ to access

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
1. The company had some A.I. experts _______ all the malfunctions in their robots.
 
A.to repair
B.be repaired
C.repair
D.to be repaired

Điền số thích hợp vào chỗ trống:
 
5 yến 9kg  kg
A.59
B.
C.
D.

Điền số thích hợp vào chỗ trống:
 
145 tạ x 4  tạ
A.580
B.
C.
D.

Viết số thích hợp vào chỗ chấm:
12 tấn 7 tạ = …….tạ.
A.127 tạ.
B.82 tạ.
C.84 tạ.
D.19 tạ.