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电话呼叫分为本局呼叫、出局呼叫、入局呼叫和 [填空(1)] 。 A. 转移呼叫
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举一反三
【单选题】Structural engineering steels are sometimes found to be brittle .
A.
at high values of strain
B.
at low ambient temperatures
C.
at moderate concentrations of carbon
D.
at high ambient temperatures
【判断题】According to carbon content, the steels are classified into low-carbon, medium-carbon, and high-carbon types.
A.
正确
B.
错误
【简答题】简述电火花线切割工艺指标的主要内容。
【单选题】Case carburising process is used to achieve in steels
A.
Improve surface hardness by adding surface layers with high carbon content
B.
Decrease hardness by transforming austenite to bainite
C.
Increase hardness by transforming austenite to martensite
D.
Increase hardness by transforming austenite to pearlite
【单选题】There are two general kinds of steels: _____ steel and _____ steel.
A.
carbon, alloy;
B.
high-speed, carbon;
C.
low carbon, high carbon;
D.
alloy, stainless
【判断题】32判断 According to carbon content, the steels are classified into low-carbon, medium-carbon, and high-carbon types.
A.
正确
B.
错误
【简答题】简述电火花线切割工艺指标的主要内容
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