周期性瘫痪合并甲状腺功能亢进,称为_________。
参考答案:甲亢性周期性瘫痪
— Sorry, sir, your car isn't ready yet. It ____ by our workers.
— Oh, my God, when can I come to fetch it? [ ]
A. is repaired
B. has been repaired
C. is being repaired
D. will be repaired
关于Na的描述正确的是( )
①Na在自然界中既以游离态又以化合态形式存在;②金属Na着火可以用泡沫灭火器救火;③实验室中少量的Na保存在煤油里;④Na-K合金做原子反应堆的导热剂;⑤Na比Cu活泼,因而Na可以从CuCl2溶液中置换出Cu ;⑥Na在空气中燃烧,主要产物是Na2O2
A.①③④⑤⑥
B.③④⑥
C.③④
D.全部