Mercury Seven are astronauts.
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举一反三
- Which of the following stars does not belong to the Seven Luminaries? A: Mercury B: Mars C: Jupiter D: Vega
- The Vega and Altair, together with five major stars, Mercury, Mars, Jupiter, Venus, and Saturn, are called the Seven Luminaries.
- The Vega and Altair, together with five major stars, Mercury, Mars, Jupiter, Venus, and Saturn, are called the Seven Luminaries.
- Exercise 1Directions: You will hear an interview of Chinese astronauts. Choose the best answer to each question.1.Which of the following statement is false? A: It’s difficult to dock two space crafts together B: Astronauts should do simulations many times before docking C: Astronauts should practice two years before docking D: Astronauts should practice two hours before docking
- Mercury is a metal pollutant that can disrupt the ecosystem. Why is mercury so disruptive to the ecosystem? A: Organisms excrete the mercury out as waste. B: Organisms use mercury as an enzyme to speed up reactions in an organism's body. C: Mercury slows down the respiration rates of primary consumers. D: Mercury can become concentrated in the tissues of organisms.
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Mercury
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Astronauts now ____________: Pilots, the astronauts who actually fly the space shuttle, account for one-third of the astronaut
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Inject a little mercury (Hg) into a horizontal glass capillary tube. The two ends of the horizontal mercury column are convex. If heating the right convex of mercury, the mercury in the capillary will move ( ). A: to the left B: to the right C: to both ends D: no
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The toxicity of alkyl mercury is 10-100 times greater than that of soluble inorganic mercury, is it right?
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A ship with black sails carried （ ） to Crete。 A: seven sheep and seven maidens B: seven men and seven women C: seven youths and seven boars D: seven youths and seven maidens