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【单选题】
100ml溶液中含8mgCa, 则溶液中Ca的浓度为( )A.
O、2mol/L
B.
O、2mmol/L
C.
2mol/L
D.
2mmol/L
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【单选题】I got a job offer from an organization working on protecting animals with extinction.
A.
threaten
B.
threatening
C.
to threaten
D.
threatened
【简答题】D Dolphins are interesting animals. Working with them is fun, because you never know what they will come up with to surprise you. Remember when your mom used to cut up your food? Circe, a show dolphin...
【单选题】Dolphins are interesting animals. Working with them is fun, because you never know what they will come up with to surprise you. Remember when your mom used to cut up your food? Circe, a show dolphin, ...
A.
before Circe gave a performance
B.
when Circe followed the instruction
C.
the moment Circe swam close to Reiss
D.
each time Reiss left the side of the pool
【简答题】锉刀一般是用（）材料制成的，丝锥和板牙通常是（）材料制成的。
【简答题】效果图的绘制在表现手法上多种多样，但整体上可以分为以 为主和以色光表现为主两种基本方法。
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