b) Rtđ=R1+R2=5+10=15Ôm

=>Uab=I*Rtđ=0.2*15=3V

Điều kiện 1 là nằm giữa

Điều kiện 2 là bằng nhau

Chỉ cần phân tích tia phân giác.

Co 2 điều kiện

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.

Water is necessary for life. People can live only a few days (44) _____ it. Yet nearly 25 million people die each year because of it. Both industrial nations and less-developed countries are worried about the (45) ______ and quantity of water in the world.

Even though people, animals, agriculture, and industry use a lot of water, there is more than enough on the Earth. Water covers about three-fourths of the Earth's surface. However, 97.4 percent of it is salt water. Three-fourths of the Earth's fresh water is frozen in glaciers and in the great polar ice caps. Most of the water we use (46) _____ from rivers, lakes, and the atmosphere. Less than one percent of the Earth's water is usable, and we use it over and over again.

One of the (47) ______ about water is distribution. Water is not always distributed where the large (48) ______ centers are. Some regions get enough rain, but it is all in one or two short rainy seasons.

Điền vào ô số 48

A. population

B. men

C. women

D. people