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【单选题】
Cu和Ni能形成置换固溶体,下列合金中硬度最大的是哪一个A.
Cu-20%Ni
B.
Cu-40%Ni
C.
Cu-50%Ni
D.
Cu-80%Ni
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【单选题】----Hello. May I speak to Rose? ---- ______.
A.
Yes, I’m Rose
B.
I will be back soon
C.
Yes, I can’t hear you
D.
This is Rose speaking
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【多选题】色谱法的系统适用性试验一般要求
A.
达到规定的理论板数
B.
固定相和流动相比例适当
C.
色谱峰拖尾因子T在0.95～1.05之间
D.
分离度R应大于1.5
E.
流动相的流速应大于1ml/min
【简答题】根据中文提示，完成对话。 A: May I speak to Lucy? B: Yea. __ 1 ( 谁)speaking, please? A: This is Rose. Are you free this evening?_ _2 ( 想)you like to see a film? B: I'd be __ 3 ( 高)to．When shall we meet then?...
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