天线有增益,因为它是有源器件。()
参考答案:错
Xinjiang is in the __ of China. But California is in the __ part of the USA. [ ]
A. west, western
B. west, west
C. western, western
单位时间内炉渣向金属供送氧的数量就是碱性炉渣的氧化能力。