题目内容
（请给出正确答案）
A、sealed sample
B、counter sample
C、duplicate sample
D、reference sample
简答题官方参考答案
（由简答题聘请的专业题库老师提供的解答）
更多“Return sample can also be called （).”相关的问题
B．flexing and extending Manipulation
C．Manipulation of traction
D．pulling Manipulation
A、would take off
B、had taken off
C、was taking off
D、is taking off
E、was taking off
F、taking off
Sometimes the earth moves between the sun and the moon. Then the earth&39;s shadow falls on the moon; no light from the sun can then reach the moon. The moon gets dark because it cannot reflect the sun&39;s light. (48).
Does the sun ever get dark during the say？ It does so when the moon hides it. Sometimes the moon goes in front of the sun. We can watch its edge when it slowly crosses the sun&39;s disc. Everything gets darker and darker; then, at last, we cannot see any part of the sun&39; s disc. The moon is hiding it completely. That is a total eclipse of the sun; sometimes only part of the sun&39;s disc is hidden; that is not a total eclipse.(49).
(50)There was a total eclipse of the moon on January 9, 2001. That event was visible from Europe, Africa and Asia. There were about 20 total eclipses of the sun between 1970 and 1999. The latest was seen on June 21 this year in Angola, Zambia, Zimbabwe, Mozambique and Madagascar.
(46)
A. Eclipses are not seen in every part of the world.
B. The earth&39;s shadow was beginning to move away.
C. We call this an eclipse of the moon.
D. It appears to be bigger than any other star.
E. It is also like a mirror and it reflects the light of the sun.
F. It is a partial eclipse of the sun.
(47)
A. Eclipses are not seen in every part of the world. B. The earth&39;s shadow was beginning to move away. C. We call this an eclipse of the moon. D. It appears to be bigger than any other star. E. It is also like a mirror and it reflects the light of the sun. F. It is a partial eclipse of the sun.
(48)
A. Eclipses are not seen in every part of the world. B. The earth&39;s shadow was beginning to move away. C. We call this an eclipse of the moon. D. It appears to be bigger than any other star. E. It is also like a mirror and it reflects the light of the sun. F. It is a partial eclipse of the sun.
(49)
A. Eclipses are not seen in every part of the world. B. The earth&39;s shadow was beginning to move away. C. We call this an eclipse of the moon. D. It appears to be bigger than any other star. E. It is also like a mirror and it reflects the light of the sun. F. It is a partial eclipse of the sun.
(50)
A. Eclipses are not seen in every part of the world. B. The earth&39;s shadow was beginning to move away. C. We call this an eclipse of the moon. D. It appears to be bigger than any other star. E. It is also like a mirror and it reflects the light of the sun. F. It is a partial eclipse of the sun.
A、Because a handwritten note is most impressive, any goodwill message sent by e-mail must always be followed by a more formal handwritten goodwill message.
B、If you frequently communicate via e-mail with the intended receiver and are certain this e-mail will be received, you may send a goodwill message via e-mail.
C、E-mail, personal notes typed on business stationery, and handwritten personal notes are equally appropriate and effective for sending all types of goodwill messages.
D、E-mail can be used for all types of goodwill messages except death condolences, for which a ready-made card is required.
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