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科研、生产中常涉及钠、硫及其化合物。 (1)实验室可用无水乙醇处理少量残留的金属钠，化学反应方程式为 。要清洗附着在试管壁上的硫，可用的试剂是 。 (2)如图为钠高能电池的结构示意图，该电池的工作温度为320 ℃左右，电池反应为2Na+xS=Na 2 S x ,正极的电极反应式为 。M(由Na 2 O和Al 2 O 3 制得)的两个作用是 。 与铅蓄电池相比，当消耗相同质量的负极活性物质时，钠硫电池的理论放电量是铅蓄电池的 __ 倍。 (3)Na 2 S溶液中离子浓度由大到小的顺序为 ，向该溶液中加入少量固体CuSO 4 ，溶液pH (填“增大”、“减小”或“不变”)，Na 2 S溶液长期放置有硫析出，原因为 (用离子方程式表示)。
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【单选题】After five hours' drive, they reached they thought was the place they had been dreaming of
A.
that
B.
what
C.
which
D.
where
【单选题】After sailing for five months, they arrived at they thought was the place they had been looking for.
A.
what
B.
that
C.
which
D.
where
【简答题】A．Because they thought he was still in China. B．Because they thought be was put into prison. C．Because they thought he was working for the Chinese government. D．Because they thought he was dead.
【简答题】A．They thought milk had great healing power. B．They thought milk could make their skin paler. C．They thought milk could stop beards growing. D．They rubbed bread soaked in milk on their faces.
【单选题】设二叉排序树中关键字由1~1 000的整数构成，现要查找关键字为363的结点，下列关键字序列不可能是在二叉排序树上查找到的序列是( )。
A.
2，252，401，398，330，344，397，363
B.
924，220，911，244，898，258，362，363
C.
925，202，911，240，912，245，363
D.
2，399，387，219，266，382，381，278，363
【简答题】C#中是否有下列关键字?
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