顺坝的主要作用是什么？
参考答案：
①调整急弯，归顺岸线，稳定航槽；②堵塞倒套、尖潭；③堵塞支汊，调整汇流处交汇角；④沿整治线束窄河宽。
In our own galaxy, the Milky Way, there are perhaps 200 billion stars, a small part of them probably have planets on which life is feasible.
A．a small fraction in which
B．a small fraction of which
C．a small fraction which
D．which a fraction of
“阳中求阴”治法的理论基础( )
A．阴阳的对立制约B．阴阳的互限互用C．阴阳的消长平衡D．阴阳的相互转化E．以上都包括
