A vessel moored with two anchors，sometimes，at an exposed roadstead to（）. ["aid turning the ship","obtain a fine bearing","increase ship swings to wind or tide","lighten the stress of anchor chai"]
综合养鱼主要有哪些模式？
以下哪些操作是无法用Action（动作）记录下来的？（） ["画笔工具的绘制","选择区域的羽化","模糊工具的使用","取消选择区域"]
成功的广告表现应具有的特征有（） ["能立刻引起注意","能引导人的视线去注意广告的主要部分","广告的主要部分必须容易被记忆","广告能引起预期的联想和感觉"]
Some （） lying in the starting air lines will give rise to corrosion and can cause water hammer. ["air","moisture","cooling water","lubricant"]
简述植物病原细菌的特点。
