先予执行
参考答案：
指民事诉讼法所规定的为了解决某些迫切需要，先予判决之前执行的一种特殊执行制度。
It was when searching for the lost book whose cover was missing ______ a secret letter addressed to his mother.
A．what he found
B．until he found
C．that he found
D．he had found
关于冲洗液压系统的不正确说法是（）。
A．最好使用专门的溶剂冲洗
B．宜采用大流量，使管路中流速达到紊流
C．冲洗中用铜锤敲打各焊口
D．冲洗达到要求的依据是滤器无太多污染物
