由盈亏平衡点示意图可知，当平衡点存在且不变时，运输量越大，所实现的盈利就（）。 ["越大","越小","不变","依情况而定"]
柜员密码输入错误次数不能超过（）次，否则将冻结柜员密码。 ["6次","3次","5次","2次"]
第三强度理论不适用于（） ["脆性材料","塑性材料","变形固体","刚体"]
电网重要测点P、Q、U、I都属于遥测。
A definite advantage of using water as a fire extiguishing agent is its characteristic of（）. ["alternate expansion and contraction as water in a liquid state becomes a vapor","absorption of smoke and gases as water is converted from a liquid to a vapor","rapid contraction as water is converted from a liquid to a vapor","rapid expansion as water absorbs heat and changes to steam"]
简述投入式液位计的测量原理？
