Bronze, after being heated by a strong flame, will change color, especially when exposure  to hydrogen .

Câu hỏi liên quan

• While studying the chemistry of human body, Dr. Rosalyn Yalow won a Nobel Prize for the research she conducted on the role of hormones.

• Superior to all others woods for shipbuilding, teak is also used for furniture , flooring, and general construction.

• Choose the best option:

  During a long drought, farmers had to find ways to ____ their crops.

ZUNIA12

• Although apples do not grow during the cold season, apple trees must have a such season in order to flourish.

• Rainwater carries unused chemicals from fields into streams or lakes, where various compounds promote the rate growing of weeds

• One of the four underlined parts marked A, B, C, D in each sentence is not correct in standard English. Identify them: 

  If I were you, I will go to the dentist’s and have the tooth checked. 

• Exercising well is as important to your health as sleep and eating correctly

• A dancing is the oldest and liveliest of the arts.

• Salmon lay their eggs and die in fresh water, although they live in salt water when most of their adult lives.

• Florida, named by the Spanish exploration Ponce de Leon, is one of the fastest growing states in the United States.

• Choose the correct answer to complete the sentence. "Having been _____ about the relationship between climate change and the spread of infectious diseases, everyone should get vaccinated."

• Listening to music on tape or even on disk is not nearly as good as to go to a live concert.

• In order to get married in this state, one must present a medical report along with your identification.

• The dentist gave me a check-up and then telling me I needed two teeth.

• American pioneers did water systems from logs with holes bored through their centers

• For many years, scientists studying the effects that the sun has on human skin.

• Before she moved to California, with its much milder climate, Betty found that her health improved considerably.

• Gold, silver, and copper coins are often alloyed whit harder metals to make them hard as enough to withstand wear.

• The number of student attending English courses at our university are increasing.

• Many birds will, in the normal course of their migrations, flying more than three thousand miles to reach their winter homes.