A. 皮肤由灰白转为灰蓝色 B. 冻伤处疼痛冻 C. 伤处感觉冷和麻木 D. 全部都对
A. 诚信 B. 爱国 C. 守法
A. 正确 B. 错误
A. between sunset and sunrise B. only between 8 AM and 4 PM C. during daylight hours in any visibility D. during daylight hours in unrestricted visibility only