氢气瓶的颜色（） ["淡兰","淡绿","黑","深兰"]
依据“风险与收益对称原则”，一项资产的风险越小，其预期报酬也就越低。（）
重矿物
白兰地
What is one thing you should be aware of when conducting a wireless site survey？（） [" 5 GHz equipment will not be able to penetrate through walls as well as 2.4 GHZ equipment."," 2.4 GHz equipment will not be able to penetrate through walls as well as 5 GHz equipment."," Mounting antennas near metal objects will slightly amplify the signal."," When determining coverage， you should begin measuring attenuation from the middle of the room."]
什么是电气设备的额定值？
