286 D ,287 D,288 C,289 C,290 C,291 D,292 C,293 A B,294 A D,295 A B D,296 A B D,297 A B,298 A C D,299 B C,300 B C D,301 A C D,302 A B,303 A B D,304 公式,305 输入,306 视觉,307 308 309 无损压缩,310 针式,311 压缩。呵呵 未必全对!参考!