In order to prevent galvanic corrosion，an aluminum boat must be insulated from the davits and gripes. Which of the following is acceptable as an insulator?（） ["Hard rubber","Canvas","Leather","Sponge rubber"]
灰土地基施工过程中应检查什么？
In battery charging rooms，ventilation should be provided（）. ["at the lowest point","near the batteries","at the highest point","only when charging is in progre"]
装载机最重要的安全装置是（）。 ["制动器","后视镜","雨刷器","喇叭"]
基金投资管理作业流程包括的主要环节有（）。 ["制定投资政策","进行证券分析","构造投资组合","基金绩效评价"]
地基施工结束，宜在一个间歇期后，进行质量验收，间歇期由什么确定？
