Trong không gian Oxyz, cho mặt phẳng α : x − z − 3 = 0  và điểm M(1;1;1). Gọi A là điểm thuộc tia Oz, B là hình chiếu của A lên α . Biết rằng tam giác MAB cân tại M. Diện tích của tam giác MAB bằng

A.  3 123 2

B.  6 3

C.  3 3 2

D.  3 3

John congratulated us ______our exam with high marks

A. for passing

B. on passing

C. to pass

D. on pass

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 35 to 44.

Here are tips that help succeed in your job interview:

Always arrive early. If you do not know (35) ______ the organization is located, call for exact directions (36) ______ advance. Leave some extra time for any traffic, parking, or (37) ______ events. If you are running late, call right away and let someone know. The best time to arrive is approximately 5 - 10 minutes early. Give (38) ______ the time to read your resume one more time, to catch your breath, and to be ready for the interview. Once you are at the office, treat everyone you encounter with respect. Be (39) ______ to everyone as soon as you walk in the door.

Wear a professional business suit. This point should be emphasized enough. First (40) ______ are extremely important in the interview process. Women should (41) ______ wearing too much jewelry or make up. Men should avoid flashy suits or wearing too much perfume. It is (42) ______ important that you feel comfortable. While a suit is the standard interview attire in a business environment, if you think it is (43) ______ informal environment, call before and ask. Regardless, you can never be overdressed (44) ______ you are wearing a tailored suit.Question 37

A. expected

B. unexpected

C. unexpectedly

D. expectedly

Đề hiđro hoá etylbenzen ta được stiren; trùng hợp stiren ta được polistiren với hiệu suất chung 80%. Khối lượng etylbenzen cần dùng để sản xuất 10,4 tấn polisitren là :

A. 10,6 tấn.

B. 13,25 tấn.

C. 8,48 tấn.

D. 13,52 tấn.

Thủy phân hoàn toàn m gam triolein trong dung dịch NaOH dư, đun nóng. Sau phản ứng thu được 22,8 gam muối. Giá trị của m là

A. 22,1.

B. 21,8.

C. 21,5.

D. 22,4.