制动器安装时，其闸瓦应紧密地抱合于制动轮的工作表面上，其接触面不得最小不得小于（）%。
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义务兵退出现役时，由义务兵所在单位财务部门按照标准和服役年限计付军人退役医疗保险费。
A. 正确
B. 错误
施工企业可以在危化品仓库进行明火作业。
A. 正确
B. 错误
鱼类有一些辅助呼吸器官:（）如（）,（）如泥鳅,（）如斗鱼,（）如肺鱼等，主要呼吸器官为().
Which two statements about the open and shared key wireless-authentication methods are true？ （）
A. Shared key authentication is considered more secure than open authentication.
B. Shared key authentication is considered less secure than open authentication.
C. If the WEP keys do not match using the open authentication method， the client will not authenticate， associate， and transfer data.
D. If the WEP keys do not match using the open authentication method， the client will still be able to authenticate and associate， but will not transfer data.
E. If the WEP keys do not match using the open authentication method， the client will still be able to authenticate， associate， and transfer data.
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