Before starting a gasoline engine on a motorboat，you should make sure for safety that（）. ["the gasoline tank is full","the bilges，cabins，etc. are thoroughly ventilated","you have fresh water on board","Each of the above is followed"]
在Windows 2000环境中，MS―DOS程序以全屏幕方式和窗口方式运行相比较，下面的说法正确的是（）。 ["两者占用的内存一样多","全屏方式占用的内存较多","窗口方式占用的内存较多","不一定"]
在创业的过程中沈思CEO认为，每100次尝试，有（）次是失败的。 ["50","80","99","20"]
有填充封闭管式熔断器的石英砂的作用是（） ["用来冷却和熄灭电弧","用来保温","用来填充空间","作用不是很大"]
镇江烟草应从以下哪几个方面释放红利，增强改革发展的活力与后劲（） ["优化卷烟结构","盘活存量资金","完善卷烟营销方式","深化用工分配制度改革","扩大卷烟销量"]
简述钢的硬度、强度、塑性、韧性与含碳量的关系。
