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【简答题】
某有机化肥中 N 、 P 、 K 的质量分数分别为 3.02 % 、 0.30 % 、 1.50 % ,则 w (NH 3 ) 为 ______ _ _ _ __ % 、 w (P 2 O 5 ) 为 __________ % 、 w (K 2 O) 为 ___________ % 。 [ A r (N) = 14.01 , A r (P) = 30.97 , A r (K) = 39.10 , A r (H) = 1.008 , A r (O) = 16.00 ]
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【简答题】Describe the mechanisms by which alloying effects affect hardenability.
【单选题】患者,男,62岁,心绞痛病史2年,4h前出现胸骨中段剧烈疼痛,舌下含服硝酸甘油不能缓解。体检:心率增强,心尖部可闻及舒张期奔马律,心电图示ST段抬高,该患者的检查结果最可能出现
A.
血糖减低
B.
白细胞减少
C.
血清心肌酶升高
D.
C反应蛋白降低
E.
红细胞沉降率正常
【简答题】How to improve the corrosion-resistance of a steel by alloying?And what measures should we take to increase the strength of stainless steels?
【单选题】One of the most common techniques is to add alloying elements that inhibit the corrosion.
A.
repulse
B.
retain
C.
relieve
D.
restrain
【简答题】With the exception of , all alloying elements raise the hardenability of steels..
【单选题】One of the most common techniques is to add alloying elements that inhibit the corrosion.
A.
restrain
B.
retain
C.
relieve
D.
repulse
【简答题】Some alloying elements are known a‘carbide formers’.What does this term mean?Beyond this,some elements are called very strong,strong or moderate carbide formers.What is meant by this?
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