什么是可碎系数？如何用可碎系数判断颗粒的可碎性？
An airplane wants a vessel to change course and proceed towards a vessel in distress. The actions of the aircraft to convey this message will NOT include（）. ["circling the vessel at least once","heading in the direction of the distress location","flashing the navigation lights on and off","crossing ahead and rocking the wing"]
用“幻灯片放映”菜单中的“设置放映方式”命令项，也能指定仅放映演示文稿中的部分幻灯片，这与采用自定义放映方案相比（）。 ["没有什么不同","可以选择的幻灯片范围不同","可以指定的幻灯片顺序不同","可以选择的幻灯片范围和指定的幻灯片顺序不同"]
专业技术职务外语考试免试条件有哪些？
应当使用（）设置从一张幻灯片淡出转到下一张。 ["自动内容步骤","“幻灯片切换”命令","“淡出”按钮","“幻灯片定时”功能"]
专业技术职务外语考试放宽外语成绩要求是什么？
