如何使用补充饲料？
A(n) （） is a special type of valve which prevents the passage of steam but allows condensate to pass. ["check valve","non-return valve","steam trap","quick closing tra"]
新增抱杆不从商务平台采购，使用什么施工模块（） ["普通塔桅安装模块","简易塔桅安装模块","钢塔桅安装模块","快装抱杆安装模块"]
The condition where a ship on the end of a tow line is riding a wave crest at the same time as its tug rides a wave crest is known as riding in（）. ["synchronism","harmony","check","ste"]
银行汇票挂失止付以后的业务状态有（）。 ["已作废","已止付","已挂失","已注销"]
为什么吃食性鱼类需要投饲配合饲料，而滤食性鱼类不需要？
