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【判断题】
宇宙射线与大气相互作用时能产生 介子衰变,放出 子。这些 子的速度接近光速(v=0.998C).如果实验室内测得的静止 子的平均寿命为 s,则8000m高空由 介子衰变放出的 子是不能飞到地面的。A.
正确
B.
错误
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【简答题】《弟子规》原文中强调读书环境的句子是 , , , 。
【单选题】If no gaskets are used in the piping joints of a Freon system, the joints must be（）
A.
finished joints
B.
welded joints
C.
ground joints
D.
soldered joints
【单选题】According to the article, why should building joints be agile?
A.
Such joints are cheap.
B.
Such joints make buildings flexible and moveable.
C.
Such joints are concrete frames.
D.
Such joints make the buildings rigid.
【单选题】The metatarsophalangeal joints are which type of synovial joints?
A.
saddle joints
B.
hinge joints
C.
condyloid joints
D.
pivot joints
E.
spheroidal joints
【多选题】Which belong to the joints of the vertebral arch ( )
A.
Ligamenta flava
B.
Interspinal ligaments
C.
Intertransverse ligaments
D.
Intervertebral disc
E.
Zygapophysial joints
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