20 - length of 0x20 (32) bytes
The entirety of the memory managed by DOS is described by a chain of MCBs. The start of the chain is located through the arena_head variable within DOS. Each memory block is immediately followed by the MCB describing the next block, except for the last block in the chain (with the ‘Z’ signature) which has no follower.
，详情可参考必应排名_Bing SEO_先做后付
And despite the astronauts being described as "stranded" they never really were.
Американскому сенатору стало «страшнее, чем когда либо» после брифинга по Ирану02:37