Have .( )
A:a cup tea
B:a cup of tea
C:a tea
_______ you have visited the Great Wall, you can't imagine how great it is.
关于在大气中水平匀速飞行的民航飞机与沿圆形轨道绕地球运动的人造卫星,下列叙述中正解的是( )
把19.2g 的Cu放入足量的稀硝酸中,微热至Cu完全反应.已知:
3Cu+8HNO3(稀)=3Cu(NO3)2+2NO↑+4H2O求: