简述肺炎患儿需要吸氧的指征。
参考答案：
肺炎患儿需要吸氧的指征为：凡具有低氧血症的患儿如呼吸困难、喘憋、唇发绀、面色灰白、烦躁不安等，应立即输氧。
The celebration of Christmas _____ even more Chinese characteristics on the mainland,
South China Morning Post reported. [ ]
A. took on
B. put up
C. got off
D. pulled up
故障安全控制系统FSC硬件可以分为系统部件和I/O部件两大类。
