断层带往往也是岩溶集中发育处，此处透水性良好，流线（）。
参考答案：密集
When reading, you should ______ your attention on the main idea and the structure of the passage, not
on specific words or sentences. [ ]
A. pay
B. focus
C. put
D. expand
滚珠丝杠副的支承方式有哪些？
