前向功率控制的对象是终端的发射功率。()
参考答案:错
Some aspects of a pilot’s job _______ be boring,and pilots often _______ work at inconvenient hours.
A.can; have to
B.may; have to
C.have to; may
D.ought to; must
小明冬天的早晨去上学,到校后觉得手很冷,根据我们学过的物理知识,请你帮他找到解决问题的2个办法,并说明这样做的物理道理.