题目内容
（请给出正确答案）
A.temporary guide base
B.permanent guide base
C.guide frame
D.foundation template
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更多“A heavy steel device that is s…”相关的问题
A、It has be heavy to prevent astronauts from floating away
B、It must also work as a SCUBA device
C、It needs to double as a hovercraft
D、It must be lightweight and easy to mover in
A.three-fifths
B.three-fives
C.third-fifths
D.three-fifth
According to the text, "nuclear tipped missiles" and "cannonball-size steel spheres" (Para. 5) ______.
A．are different in nature.
B．serve similar functions.
C．are identical to each other.
D．pose real challenges.
To reduce weight, plastic has taken ______ of iron and steel in making boats.
A．its place
B．place
C．the, place
D．a place
A.Coated Carbide
B.High Speed Steel
C.ube-Boronnitride
D.Polymerize Crystal Diamond
A．its place
B．place
C．the place
D．a place
Pistons for modern engines are made of _______.
A cast iron
B steel
C aluminum-alloy
D tin-alloy
