正确答案: C

淬火+低温回火

题目：十字头销、活塞销、凸轮等零件渗碳后应立即进行( )。

解析：C

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举一反三的答案和解析：

[单选题]感温探测器应经过验证，当温度以每分钟不超过_____的速率升高时，在温度超过78℃之前动作，但在温度超过54℃之前不应动作。

1℃

[单选题]初次申请适用于两港间航程50nmile及以上客船轮机长、轮机员适任证书者，应当在其他种类的3000KW及以上海船上担任相应职务满____个月，任职表现和安全记录良好，并在客船上任相应见习职务____个月。

12/3

[单选题]第一组：When a nominated surveyor or recognized organization determines that the condition of the ship or its equipment does not correspond substantially with the particulars of the Certificate (IOPP) or is such that the ship is not fit to proceed to sea without presenting an unreasonable threat of harm to the marine environment, such surveyor or organization shall immediately ensure that corrective action is taken and shall in due course notify the Administration. If such corrective action is not taken, the Certificate shall be withdrawn and the Administration shall be notified immediately; and if the ship is in a port of another Party, the appropriate authorities of the port State shall also be notified immediately. When an officer of the Administration, a nominated surveyor or a recognized organization has notified the appropriate authorities of the port State, the Government of the port State concerned shall give such officer, surveyor or organization any necessary assistance to carry out their obligations under this regulation. When applicable, the Government of the port State concerned shall take such steps as will ensure that the ship shall not sail until it can proceed to sea or leave the port for the purpose of proceeding to the nearest appropriate repair yard available without presenting an unreasonable threat of harm to the marine environment.

(3)