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【单选题】
某船航速20kn，航行1000nmile，需要燃油120t。现仅存燃油110t，至中途港尚有800nmile的航程。若船舶计划到达中途港时预留燃油10t，问船舶速度（）。A.
20.4t
B.
17.8t
C.
19.2t
D.
18.9t
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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】_______ 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 ,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 中转移到 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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