太阳的巨大能量来源于太阳中心的核裂变。[ ]
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Every year, typhoons and losses ______ lead to are frightening though measures have been taken.
A.which
B.that
C.they
D.ones
钝化镁是一种强脱[S]剂,Mg的熔点温度为()℃、汽化点温度为()℃。