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【单选题】
船内重物垂直上移,下列哪种说法是正确的( )A.
重心不变
B.
稳心不变
C.
高度不变
D.
稳心半径改变
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【简答题】阅读理解。 Boys' English grades are up to a tenth worse when high numbers of girls are in the class with them, though girls' grades are unaffected. Boys do worse in English when there are girls in their cl...
【单选题】There are fifty-five students applying for the position, ______ are girls.
A.
two-third of whom
B.
second-thirds of them
C.
second-threes of whom
D.
two-thirds of whom
【单选题】膜分离过程中的影响因素，说法错误的是：( )
A.
当料液含有多种蛋白质时，与单组分相比，总蛋白质浓度升高；因此，透过通量下降。
B.
对荷电膜，具有与膜相同电荷的分子截留率较低，反之则较高；
C.
未发生浓差极化时，通量与压差成正比。
D.
膜分离过程中有无机盐存在时，盐浓度的增加一般会使膜通量增加。
【单选题】----He thinks that girls are smarter than boys when it comes to learning English. ----But two years ago he thought_______.
A.
so
B.
otherwise
C.
opposite
D.
different
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