单项选择题
关于一级建造师执业岗位范围的表述中，不正确的是（）。
A.一级注册建造师可担任大、中、小型工程施工项目负责人
B.注册建造师担任施工项目负责人期间原则上不得更换
C.注册建造师还可以从事建设工程项目总承包管理或施工管理，建设工程项目管理服务
D.所有工程施工项目负责人必须由本专业注册建造师担任
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如果票据出票人在汇票上记载“不得转让”等字样,持票人就不能转让该汇票,否则该票据无效。( )
A.正确
B．错误
