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【多选题】
下列关于卫生器具的水封，说法正确的是________。A.
卫生器具与生活污水管道或其他可能产生有害气体的排水管道直接连接时，必须在排水口以下设水封装置，其水封深度不得小于50mm
B.
卫生器具与生活污水管道或其他可能产生有害气体的排水管道直接连接时，必须在排水口以下设水封装置，其水封深度不得小于30mm
C.
坐便器等内置存水弯的卫生器具，不排水口以下再设水封装置
D.
医院、教学、科研单位等有化学试剂排放的排水系统，不在同一房间内的卫生器具不得共用一个水封装置给水方式
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【简答题】三阶方阵A的特征值为1，-1，2，则【图片】的特征值为（ ）
【简答题】三阶方阵A特征值为3，－1，2，则【图片】的特征值为 .
【简答题】A．Because they are alike. B．Because the man's briefcase has a lock. C．Because the man's briefcase is smaller. D．Because she doesn't have a briefcase.
【简答题】A．Because she helped him in the kitchen． B．Because it's the girl's birthday． C．Because she can't cook well． D．Because her father enjoys cooking．
【简答题】A．Because it serves only a few specialties. B．Because it's too crowded. C．Because it's too costly. D．Because the service is too slow.
【简答题】A．Because it serves only a few specialties. B．Because it's too crowded. C．Because it's too costly. D．Because the service is too slow.
【简答题】A．Because it serves only a few specialties. B．Because it's too crowded. C．Because it's too costly. D．Because the service is too slow.
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