Signs of racking stresses generally appear at the（）. ["bow and stern shell frames and plating","junction of the frames with the beams and floors","garboard strake，at each side of the keel","thrust bearing of the main shaft"]
人力资源需求的预测技术有（） ["经理判断法","趋势分析法","工作分析法","比例分析法"]
财税库银横向联网系统（TIPS）是按照（）小时连续运行的。 ["5X8","7X24","5X24","7X12"]
跨越舱室较多的大长度电缆的导电芯线截面积不小于（） ["0.5mm2<\/sup>","0.25mm2<\/sup>","0.75mm2<\/sup>","1mm2<\/sup>"]
Sidewise force of the propeller tends to throw a vessel’s stern to the right or left，depending on rotation. This force is caused by（）. ["back current from the rudder","greater pressure on the right or left side of the propeller，depending on rotation","lower pressure on the right or left side of the propeller，depending on rotation","torque from the velocity and angle at which the surrounding water impinges upon the propeller blade"]
电网的一类障碍如何调查？
