Access to a cargo pumproom on a tanker carrying grades A，B，C or D liquid cargoes shall be（）. ["at least 13.1 feet away from the galleys，living quarters or navigation spaces","from the open deck","only from areas equipped with power ventilation systems","isolated from any part of the vessel which normally contains sources of vapor ignitio"]
对署名举报人实行“三到位”原则是指（）。 ["承办单位领导到位","承办人到位","与被举报人接触到位","与举报人接触到位"]
以下哪些外部因素会影响现代运动训练目标（） ["竞赛对手的情况","竞赛规则的变化","竞赛场地、器材的特点","竞赛分组情况等"]
页面设置对话框由四个部分组成，属于页面对话框的是（）。 ["版面","纸张大小","保存","打印"]
下列（）不是医生与传染病人沟通的原则与方法。 ["营造社会环境","病人利益第一和给以支持与希望的原则","传播必要信息","运用家庭动力学原理"]
（）是在在频率不变的情况下，通过改变输出脉冲的宽度，从而使输出信号的平均值发生改变，达到控制外部对象的目的。
