The securing systems for containers were developed to prevent container movement during which ship motion?（）. Surge。 Roll。 Sway。 Yaw。
涂层性能测定有哪些项目？
The explosive range of a mixture of flammable vapors is specified as a percentage of （）. flammable vapor by volume in air。 oxygen present to support combustion。 the temperature of the flash point。 the lower limit of explosibility of the mixture。
大唐做摄像头这个项目在遵义花费（）钱。 一个亿。 两个亿。 三个亿。 五点八个亿。
文本文件中可以插入图片。
焊接厚度为100mm的钢板时，宜采用（）
