6;1080;1000;2460;4.5;300;30;10
The police chief advised his men to keep________ and not lose their tempers.
A.calm
B.quiet
C.still
D.silent
不是慢性砷中毒特异性症状的是()
A.皮肤色素代谢异常
B.掌跖部皮肤角化
C.末梢神经炎
D.乌脚病
E.麻痹性震颤