海陆风主要是（）原因形成的。 ["动力","摩擦力","热力","惯性离心力"]
钩虫病的实验诊断方法最常选用（）. ["直接涂片法","饱和盐水浮聚法","钩蚴培养法","免疫学诊断","十二指肠引流法"]
超声波流量计上游侧直管段长度需要（）以上 ["A、5D","B、10D","C、30D","D、50D"]
相对湿度大于（）不得涂漆。 ["40％","50％","60％","80％"]
主要以幼虫期对人致病的线虫是（）. ["蛔虫","鞭虫","蛲虫","钩虫","旋毛虫"]
单点喷射系统是利用（）和（）来控制空燃比的。
