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【多选题】
下列关于药物纯度的叙述,错误的是( )A.
药物的纯度反映了药物质量的优劣
B.
含量测定又称为纯度检查
C.
药物纯度与试剂用纯度可相互替代
D.
药物杂质检查又称纯度检查
E.
药物中所含杂质是影响纯度的主要因素
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举一反三
【单选题】行星齿轮机构中太阳轮,行星架和齿圈三者齿数关系是( )。
A.
太阳轮齿数比齿圈多
B.
齿圈是三个中齿数最多的
C.
行星架齿数等于太阳轮与齿圈齿数之和
D.
太阳轮是三个中齿数最多的
【单选题】________ of this term, we will have learnt 4 books.
A.
At the end
B.
By the end
C.
In the end
D.
At an end
【单选题】We can test LANGUAGE (to find out what our students have learnt): Grammar, vocabulary, spelling and _______.
A.
pronunciation
B.
listening
C.
speaking
D.
Writing
【简答题】We have learnt that there is a good demand for cameras in your market,and take this opportunity for enclosing our quotation sheet No.120 for your consideration.
【单选题】We are going to have fun ____ English together.
A.
to learn
B.
learning
C.
learn
D.
learnt
【单选题】We have learnt a great deal from all the places we ________.
A.
visit
B.
will visit
C.
would visit
D.
have visited
【单选题】—How many English words have you learnt now? —We had learnt over 1,500 English words ___________ the end of last week.
A.
at
B.
in
C.
by
D.
with
【单选题】We spend as much time as we can _____ English.
A.
learn
B.
to learn
C.
learning
D.
have learnt
【单选题】So far，we_______ lots of English words．
A.
will learn
B.
are learning
C.
has learnt
D.
have learnt
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