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【单选题】
由固定的消防水源、消防泵、泡沫比例混合器、泡沫产生装置和管道组成,永久安装在使用场所,当被保护场所发生火灾需要使用时,不需要其他临时设备配合的泡沫灭火系统,称为 。A.
移动式泡沫灭火系统
B.
半固定式泡沫系统
C.
固定式泡沫灭火系统
D.
液上喷射泡沫灭火系统
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皮皮学刷刷变学霸
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【单选题】盐酸氯丙嗪注射液中的Vc起抗氧剂的作用，维生素C的最大吸收波长为243nm，盐酸氯丙嗪最大波长是306nm和254nm，则采用紫外-可见分光光度法测定盐酸氯丙嗪注射液的含量时，选择的最佳测定波长应该为
A.
243nm
B.
254nm
C.
306nm
D.
280nm
【单选题】Newly-found fossilized tracks in Alaska proved that dinosaurs' migration between Asia and North America took place ______.
A.
much earlier than experts previously thought
B.
much later than experts previously thought
C.
after Asia became an independent continent
D.
sometime around 25 million years ago
【简答题】Python语句’’.join（list（’helloworld!’））执行的结果是（）。
【单选题】The muscles of a fossilized animal can sometimes be reconstructed because
A.
they were preserved with the present relatives of the animal.
B.
they were lodged inside the animal’s skull.
C.
they were hardened parts of the animal’s body.
D.
they were attached to the animal’s skeleton.
【简答题】写出语句的运行结果: li = ["apple", "peach", "banana", "pear"] (1)','.join(li) (2) '.'.join(li)
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