通常小区导频覆盖门限是大于（），要保证信号可靠解调的最小导频覆盖门限一般需大于（）。 ["-10dB；-8dB","-12dB；-10dB","-14dB；-12dB","-15dB；-13dB"]
我国活跃的私募股权基金的资金来源主要有（） ["券商","政府","外资","民营企业"]
简述出血对机体的影响。
机器启动不起来，判断故障为喷油嘴不喷油，应首先检查燃油滤清器是否堵塞。
The hot expanding gas rotates the blades of the exhaust turbine, thus giving out large part of its power, which drives （）. ["the oil separator","the fresh water generator","the compressor","fire pum"]
痕量元素
