Shipowner is a person who（）. has the ownership of a vessel。 has the ship owned by a shipping company。 owns no ship of a shipping company。 owns the ship named by a register of shipping。
生产经营单位在建设项目主体工程设计完成后，应当委托有相应资质的设计单位对建设项目安全设施进行设计，编制安全设施设计。
Which of the valves listed is NOT considered to be a hydraulic system directional control valve?（） Spring-centered valve。 Unloading valve。 Three-position valve。 Two-position valve。
ITU-TG.707建议规范的SDH标准速率为（） 34368kbit/s。 155520kbit/s。 622080kbit/s。 2488320kbit/。
以未成年人财产抵押会导致抵押权无法实现。
外脚手架的高度，在工程量计算及执行定额内，均自（）算至檐口顶。
