新生儿硬肿症的主要临床表现
A. 呕吐和腹泻
B. 皮肤凉硬,体温不升
C. 皮肤大理石斑纹
D. 皮肤坏死形成坏疽
E. 体温波动在1℃以上
_________ is a service provided by ground-based controllers who direct aircraft on the ground and in the air
ACC
B. ATC
C. Dispatcher
D. Security staff
En-route air traffic controllers work in facilities called ______.
ACC
B. tower
C. terminal
D. airport