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【单选题】
“绿色化学实验”进课堂，某化学教师为“氯气与金属钠反应”设计了如下装置与操作以替代相关的课本实验。实验操作：钠与氯气反应的装置可做出如图改进，将一根玻璃管与氯气发生器相连，玻璃管内放一块大的金属钠（已吸净煤油），玻璃管尾部塞一团浸有NaOH溶液的棉花球。先给钠预热，到钠熔融成圆球时．撤火，通入氯气，即可见钠着火燃烧，生成大量。以下叙述错误的是（）。A.
反应生成的大量是氯化钠晶体
B.
玻璃管尾部塞一团浸有NaOH溶液的棉球是用于吸收过量的氯气，以免其污染空气
C.
钠着火燃烧产生苍白色火焰
D.
若在棉球外沿滴一滴淀粉碘化钾溶液，可根据颜色变化判断氯气是否被碱液完全吸收
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】What's your ______ plan? Please tell us ______. [ ]
A.
specific, specific
B.
specifically; specifically
C.
specific; specifically
D.
specifically; specific
【单选题】When you complete Part 1, you will be able to learn().
A.
to what do for specific hazards
B.
what to do for specific hazards
C.
what do for specific hazards
【单选题】What is specific for the Inquisitorial court system?
A.
It is a legal system in which the court is allowed to request specific evidence, particularly evidence by torture
B.
It is a legal system in which the court is actively involved in investigating the facts of the case
C.
It is a legal system in which the court is primarily that of an impartial referee between the prosecution and the defense
D.
It is a legal system in which the court is absent and the process is "party-centered" - the parties decide together
【简答题】To be specific, what does the passage mainly discuss about?
【单选题】What is a platform-specific model (PSM)?
A.
) A specific hardware platform.
B.
) A precise model of the software architecture before a commitment is made to a specific platform.
C.
) A precise model of the software architecture mapped to a specific platform.
D.
) A graphical or textual description of the software.
【单选题】There is no specific rule ______ what we should wear to a dinner party.
A.
because of
B.
as to
C.
as of
D.
but for
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