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11.4 文 件 访 问 方 法 (access)<br />
顺 序 存 取<br />
read next<br />
write next<br />
reset<br />
no read after last write<br />
(rewrite)<br />
直 接 存 取<br />
read n<br />
write n<br />
position to n<br />
read next<br />
write next<br />
rewrite n<br />
n = relative block number