各车在走行时（）其它操作，各移动设备移出后在（）禁止行车
参考答案：不准作；未返回原位前
My younger sister is always _________ but she also likes listening to others quietly.
A．outgoing
B．angry
C．calm
D．friendly
磁共振谱的缩写符号为（）
A.NMR
B.UV
C.IR
D.MS
E.CD
