膈肌
单位重量液体具有的总势能，称为（）。 ["位置水头","压强水头","测压管水头","流速水头"]
水闸的三个主要组成部分是（）、（）和（）。
You have been called upon to add location-based services into an existing controller-basedwireless design which primarily encompasses handheld devices such as barcode scanners andCisco 7920 wireless IP phones. In which mode should you deploy the additional access points toachieve the density required without excessive co-channel interference？（） ["tracking mode","monitor mode","location mode","sniffer mode"]
（）主要表现为估价师与委托人之间直接的利益冲突，这种利益冲突的法律关系单一，利益冲突只发生在估价师与委托人之间。 ["直接利益冲突","同时性利益冲突","单一关系利益冲突","复合关系的利益冲突"]
在一个测站上，高差的正、负号说明什么问题？
