在调查过程中，一共发出了690份调查问卷，其中回收了636份，有效问卷581份，有效率达到了91.35%。
We sent 690 questionnaires, and 636 were returned. The valid questionnaires were 581 and the effective rate reached 91.35%.
在调查过程中，一共发出了690份调查问卷，其中回收了636份，有效问卷581份，有效率达到了91.35%。
We sent 690 questionnaires, and 636 were returned. The valid questionnaires were 581 and the effective rate reached 91.35%.
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