题目内容

钢中合金元素C、Si、Mn、P、S对钢材的强度、塑性和韧性有哪些影响?

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急性脊髓炎时,出现膈肌麻痹、呼吸暂停,提示病变部位是()。

A. C3
B. 颈膨大部
C. T8
D. T9
E. T10

不锈钢阀门水压试验时,水中氯离子的质量分数不得超过()x10—6。

A. 10
B. 20
C. 25
D. 50

混凝土拌合物流动性越大,和易性越好

A. 正确
B. 错误

It is abnormal that when the engine is being turned by the turning gear or by hand, ().

A. water discharges from the indicator cocks
B. no water is leaking into crankcase
C. no water in the scavenge belt
D. the rpm is lower than the speed of Dead Slow Ahead

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