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【多选题】
附睾附着于睾丸的附着缘，分为（）几部分.A.
附睾管
B.
附睾头
C.
附睾体
D.
附睾尾
E.
输精管
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举一反三
【单选题】the exploration of the botanical world on a large scale.
A.
It was not until the eighth and nineth centuries that; had begun
B.
It was not until the eighth and nineth centuries when; began
C.
Not until the eighth and nineth centuries did; begin
D.
Until the eighth and nineth centuries; began
【单选题】The eighth and nineth 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。
【单选题】Bill is ________. [ ]
A.
eigh years old
B.
eigh year old
C.
eighth years old
D.
eighth years old
【简答题】元件的类型有: 、 按钮和影片剪辑。
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