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【判断题】
增加测定次数可以提高分析结果的准确度A.
正确
B.
错误
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【单选题】______ the 1500s ______ the first European explored the coast of California.
A.
It was not until... when
B.
It was until... when
C.
It was not until... that
D.
It was until... that
【单选题】B In the 1500s，the camera was invented． However，in the early 1800s people found a way to make the pictures permanent． Even then，photography was a new field． Most families had their pictures taken by p...
A.
In the 1500s．
B.
In the 1600s．
C.
In the 1700s．
D.
In the 1800s．
【单选题】_______ the 1500s ____ the first Europeans explored the coast of California.
A.
It was until…then
B.
It was not until…when
C.
It is until…that
D.
It was not until…that
【单选题】Whose possession has the house _________ since the 1500s?
A.
taken
B.
been taken
C.
been in
D.
come into
【简答题】溶剂浸提法是指____,又称为____。溶剂萃取法是在样品液中加入一种____溶剂,这种溶剂称为____,使待测成分从____中转移____中而得到分离。
【单选题】某商场第一季度的销售额比去年同期销售额增长了4％，该商场的综合价格指数比去年上涨了5％，则该商场销售量增长了( )。
A.
2％
B.
-0．95％
C.
0．96％
D.
-0．96％
【单选题】It () the 1500s () the first European explored the coast of California.
A.
was not until / that
B.
is not until / that
C.
is not until / when
D.
was until / that
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