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【简答题】
制备金属的方法有热分解法、熔盐电解法、热还原法和利用水溶液等相关反应来制备。由于碱金属和碱土金属都非常活泼,单质具有强还原性等特点,因此制备碱金属和碱土金属单质经常采用 和 两种方法。
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【简答题】Although they plant trees in this area every ?Although they plant trees in this area every year, the tops of some hills are still _______. A) blank B) hollow C) vacant ...
【单选题】Although they plant trees in this area every year, the tops of hills are still ______.
A.
blank
B.
hollow
C.
vacant
D.
bare
【单选题】Although they plant trees in this area every year, the tops of some hills are still
A.
blank
B.
hollow
C.
vacant
D.
bare
【单选题】Although they plant trees in this area every year, the tops of some hills are still ______.
A.
bare
B.
empty
C.
blank
D.
vacant
【单选题】They plant fruit __________ vegetables on their farm. [ ]
A.
but also
B.
as well as
C.
as well
【单选题】Although they plant trees in this area every year, the tops of some hills are still _____. [ ]
A.
blank
B.
bare
C.
solid
D.
rare
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