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【多选题】
下列关于合金元素对珠光体转变时碳化物形成的影响描述正确的是A.
碳化物形成元素在γ中的缓慢扩散是推迟珠光体转变时碳化物形成的决定因素。
B.
Al、Si 间接地抑制渗碳体的形成，推迟珠光体转变。
C.
Al、Si 能加速渗碳体的形成，促进珠光体转变。
D.
Ni、Co对珠光体转变时碳化物的形成没有明显影响
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举一反三
【简答题】A．Before the meal. B．During the meal. C．When the guest arrives. D．When the guest leaves.
【单选题】What should be done first when there are no available times for the guest to make a reservation:
A.
Ask the guest to find another restaurant by himself.
B.
Suggest the guest to dine elsewhere.
C.
Ask the guest if another time or date would work for them.
D.
Ask the guest if he needs directions or a taxi to bring him out.
【简答题】What is the nature of the conflict between Abner and his landlords in "Barn Burning"?
【判断题】The point of view in Barn Burning is the third person narration and the narrator is omniscient.
A.
正确
B.
错误
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