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【单选题】
维生素D缺乏性手足搐搦症发生惊厥是由于A.
血钾浓度降低
B.
血钠浓度降低
C.
血钙浓度降低
D.
血磷浓度降低
E.
血镁浓度降低
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【简答题】A．He has had a very quiet night. B．He has had a very restless night. C．He has had a very miserable night. D．He has had a romantic night.
【简答题】A．Jack has made others wait before. B．Jack has often had to wait for Shelly. C．Jack enjoys playing tricks with others. D．Jack doesn't usually make people wait.
【单选题】If metal is heated and then cooled very quickly, , by dipping in cold water, it will be very hard but will break easily.
A.
what’s more
B.
in general
C.
for example
D.
on the other hand
【简答题】ATM 提供了一种应用独立的服务,主要表现在时间独立和( )。
【简答题】使用维吉尼亚密码加密明文youaresocute,密钥为love
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