对于测量天馈类驻波比,常用的仪器是()
A、MIT
B、SITEMASTER
C、测试手机
D、GPS
参考答案:B
Exploring ________ space is exciting, yet dangerous. There is _______need for both robots and humans for space exploration.
A.the; a
B.a; the
C./; a
D./; /
呼吸道感染()
A.咳嗽伴发热
B.咳嗽伴胸痛
C.咳嗽伴呼吸困难
D.咳嗽伴咯血
E.咳嗽伴哮鸣音