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【简答题】
凯氏定氮法消化过程中H2SO4的作用是 ,CuSO4的作用是 。
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皮皮学刷刷变学霸
举一反三
【简答题】电阻式传感器分为哪几种?分别适用于哪种场合?
【简答题】热电阻传感器有哪几种?各有何特点及用途?
【单选题】I haven’t seen you for ages. How are you ______ with your English study?
A.
holding on
B.
going on
C.
keeping on
D.
getting on
【简答题】岩溶是指（）在水的作用下形成的溶蚀地貌现象。
【单选题】I haven’t seen you for so long. How have you been?
A.
Not bad.
B.
Excuse me.
C.
Nice to meet you too.
D.
Thank you.
【单选题】—I haven’t seen you for ages. Where have you been? — I _______ on leave in Europe.
A.
have been
B.
am
C.
was
D.
had been
【单选题】听力原文：M: Where did you get that rare book? I haven’t seen you read it before. W: It was packed away until last week. It’s a family heirloom. Q: What do we learn about the rare book? (18)
A.
It has been in her family a long time.
B.
Her boyfriend gave it to her.
C.
The family doesn't like it.
D.
It is a family disgrace.
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