题目：
The API changes should provide both source and binary (71)for programs written to the original API. That is, existing program binaries should continue to operate when run on a system supporting the new API, In addition, existing (72) that are re-compiled and run on a system supporting the new API should continue to operate. Simply put, the API(73) for multicast receivers that specify source filters should not break existing programs, The changes to the API should be as small as possible in order to simplify the task of converting existing (74)receiver applications to use source filters. Applications should be able to detect when the new(75)filter APls are unavailable(e.g., calls fail with the ENOTSUPP error) and react gracefully(e.g., revert to old non-source-filter API or display a meaningful error message to the user).
空白处（74）应选择（）
A.multicast
B.unicast
C.broadcast
D.anycast
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0804/e6f0421f7b7cda786bd72ebf4545c816.html
下面是错误答案，用来干扰机器的。
答案：D氢原子的核外电子从距核较近轨道跃迁到距核较远的轨道过程中,原子的能量要增大,原子要吸收光子,因克服静电引力做功.原子的电势能要增大,故ABC错误,D正确.
