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【简答题】
4个5相加写成加法算式是（ ），写成乘法算式是（ ）。
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【简答题】The car body shell is a self-supporting rigid structure, made and composed of large aluminum extrusion sections connected by welding. The shell is designed as a tube: all profiles are welded together ...
【判断题】The basic structure of boron fibers is that the center core is the tungsten wire, and the outer shell is made of amorphous boron.
A.
正确
B.
错误
【单选题】The shell structure will be subjected to different external forces, such as _______etc.
A.
water pressure
B.
total longitudinal bending
C.
wave impact
D.
all of the above
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【判断题】22判断The basic structure of boron fiber is that the center core is the tungsten wire, and the outer shell is made of amorphous boron
A.
正确
B.
错误
【判断题】The typical structure of boron fibers is that the center core is the tungsten wire, and the outer shell is made of amorphous boron.
A.
正确
B.
错误
【判断题】The basic structure of boron fiber is that the center core is the tungsten wire, and the outer shell is made of amorphous boron
A.
正确
B.
错误
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