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【多选题】
横流膜微滤流体流动方式有四种组合，即：旋转横流、轴向横流、内旋转横流和内轴向横流。在其他过滤条件相同的情况下，通过对四种流动方式做系统对比，确认（ ）方式的性能最优。A.
内旋转横流
B.
旋转横流
C.
内轴向横流
D.
轴向横流
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【简答题】真核细胞的核糖体由沉降系数各为____ S和 ____S的两个亚基组成。大亚基含 S rRNA, S rRNA, S rRNA各一分子和大约 ____种蛋白质。小亚基含 ____SrRNA和大约 种蛋白质。
【单选题】Helen asked her father _____. [ ]
A.
if it was a balloon in the sky
B.
where could she get this kind of book
C.
that he would show her around the farm
D.
if they will have fish for lunch
【单选题】She wanted to improve her English to a point where she could speak comfortably with anyone.
A.
a. She wanted to become fluent in English.
B.
b. She wanted to advance her English ability like a native speaker.
C.
c. She wanted to improve on her English.
D.
d She wanted to fluent her English.
【简答题】She had got to the point where she felt that she could not take any more.
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