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对骨折病人的急救原则
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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。
【简答题】溶剂浸提法是指用适当的溶剂将固体样品中的某种被测组分浸取出来,又称为____。溶剂萃取法是在样品液中加入一种与样液互不相溶的溶剂,这种溶剂称为____,使待测成分从一相中转移到另一相中而得到分离。
【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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