Nguyễn Tuyết Mai ơi số nguyên tố hay sao á

tui

Hỗn hợp rắn X chứa NaHCO₃, Ca(HCO₃)₂, BaCO₃ và K₂CO₃. Nung hỗn hợp X đến khi khối lượng không đổi thu được hỗn hợp rắn Y. Trong Y chứa

A. Na₂CO₃, K₂CO₃, BaCO₃ và CaCO₃

B. Na₂O, K₂O, BaCO₃ và CaCO₃

C. Na₂CO₃, K₂CO₃, BaO và CaO

D. Na₂CO₃, K₂CO₃, Ca(HCO₃)₂ và Ba(HCO₃)₂

Read the following passage and choose the correct word or phrase that best fits each of the blanks. Fill in the appropriate word in question 33

Education is more important today than ever before. It helps people acquire the skills they need for such everyday (25) _______ as reading a newspaper or managing their money. It also gives them the specialized training they may need to (26) _______ for a job or career. For example, a person must meet certain educational requirements and obtain a license or certificate before he can practice law or medicine. Many fields, like computer operation or police work, (27) _______ satisfactory completion of special training courses.

Education is also important because it helps people get more out of life. It increases their knowledge and understanding of the world. It helps them acquire the skills that make life more interesting and enjoyable, such as the skills needed to participate in a sport, paint a picture, or play a musical (28) _______. Such education becomes increasing important as people gain more and more leisure time. Education also helps people adjust to change. This habit has become necessary because social changes today take place with increasing speed and affect the lives of more and more people. Education can help a person understand these changes and provide him (29) _______ the skills for adjusting to them.

A. appliance

B. equipment

C. instrument

D. device