建造师在工作中必须严格遵守法律、法规和( )的各项规定，恪守职业道德。
A．行业管理
B．企业管理
C．企业制度
D．工程建设强制性标准
参考答案：A
John passed the examination though he had only spent _______ on the subject as others had done.
A．as half time much
B．as half much time
C．half as time much
D．half as much time
一台电收尘器设计风量为240000m3/n，如果收尘器的断面积为，主管道为Φ2200mm，问管道风速和电场风速各为多少？
