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【单选题】
H4%( )H1/25。A.
小于
B.
大于
C.
等于
D.
小于等于
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【简答题】Compute the mass fractions of ferrite and cementite in pearlite.
【单选题】The austenite to pearlite transformation is essentially the decomposition of austenite into almost pure ferrite and ().
A.
bainite
B.
cementite
C.
martensite
D.
pearlite
【简答题】Pearlite can be subdivided into , andaccording to layer thickness of the lamination.
【简答题】伺服电动机也称为执行电动机，在自动控制系统中作为。
【判断题】Transformation temperature of fine pearlite is lower than that of coarse pearlite.
A.
正确
B.
错误
【单选题】The thickness ratio of the ferrite and cementite layers in pearlite is approximately ( ).
A.
8 to 1
B.
6 to 1
C.
5 to 1
D.
4 to 1
【简答题】Thethickness ratio of the ferrite and cementite layers in pearlite isapproximately ( ).A. 8to 1B. 6to 1C. 5to 1D. 4to 1
【单选题】Pearlite is a two-phased, lamellar structure composed of alternating layers of ().
A.
ferrite and cementite
B.
austenite and cementite
C.
austenite and ferrite
D.
liquid and cementite
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