在windows 7启动之前按（）键可以“高级启动选项”界面。 ["F8","F12","F5","F4"]
电影史上几次大的技术进步有（）。 ["从黑白到彩色","从无声到有声","电脑成像技术","从纪实到虚幻"]
总行销售管理部门在做好市场需求调研、细分客户群体的基础上，挑选合适的产品（包括产品（）等），安排销售事宜。 ["类型","期限","款数","规模"]
煤气三大危害是指（） ["中毒","爆炸","着火"]
When launching a lifeboat，the tricing pennants should be released（）. ["before the boat is lowered from the stowed position","as the boat-fall blocks break clear of the davit head","before the boat is lowered from the embarkation level","after the boat is released into the water"]
试述超声波粘合的工作原理。
