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【单选题】
以下的输出结果是( )A.
12
B.
34
C.
12345
D.
提示出错、无结果
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】the exploration of the botanical world on a large scale.
A.
It was not until the eighteenth and nineteenth centuries that; had begun
B.
It was not until the eighteenth and nineteenth centuries when; began
C.
Not until the eighteenth and nineteenth centuries did; begin
D.
Until the eighteenth and nineteenth centuries; began
【单选题】The eighteenth and nineteenth centuries _____ the widespread use of electricity and the birth of the steam engine , leading to the development of factories and cities.
A.
watched
B.
observed
C.
saw
D.
showed
【简答题】活塞顶部类型有__、__和__三类。
【简答题】何谓变形固体?在材料力学中对变形固体有哪些基本假设?
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