蒸汽的初压力和终压力不变时，提高蒸汽初温能提高朗肯循环热效率。
参考答案：对
Griffin is naughty, talkative, casual, but _____, his classmates think he is not so tiresome
A．in a way
B．in other words
C．all in all
D．on the contrary
用来描述天线对发射功率的汇聚程度的指标是（）
A、带宽
B、功率
C、增益
D、极性
