The halves of the covers, formally called ram blocks, are available in a variety of configurations.
盖的两半，通常称之为闸板块，有不同的外形。
The various ram blocks can be changed in the ram preventers, enabling the well team to optimize BOP configuration for the particular hole section or operation in progress.
闸板防喷器中不同的闸板块可以更换，能够使井队优化防喷器的外型，对于某一特殊的井眼部分或者作业进程。
Late paging space allocation causes paging disk blocks not to be allocated until its corresponding pages in RAM are touched.
晚分页空间分配策略会直到RAM中的页面被修改时才分配相应的分页磁盘块。
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