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【多选题】
在氯化物检查中,加入稀硝酸的作用是A.
加速氯化银沉淀的生成
B.
加速碳酸银沉淀的形成
C.
避免磷酸银沉淀的形成
D.
避免氧化银沉淀的形成
E.
产生较好的乳浊
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【单选题】—How many members are there in the English Drama Club?— the members is twenty, of them are
A.
—How many members are there in the English Drama Club? —____ the members is twenty, ____ of them are girls. A．A number of; three-fourth
B.
A number of; three-fourths
C.
The number of; three-fourth
D.
The number of; three-fourths
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A.
take up
B.
make up
C.
set up
D.
fix up
【单选题】John is one of the staff members who ___to be sent abroad for further study.
A.
is going
B.
are going
C.
have been going
D.
has been going.
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A.
cured
B.
secured
C.
mended
D.
healed
【简答题】简述LH型电子燃油喷射系统的组成和各部分的作用。
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