中国终于有了自制的航空母舰,这确实值得骄傲。
China has owned its first homemade aircraft carrier finally. That's really something to be ____ ____.
计算:(3﹣1)0﹣12cos30°tan45°+(13)﹣2.
如图所示,在恒力F作用下,a、b 两物体一起沿粗糙竖直墙面匀速向上运动,则关于它们受力情况的说法正确的是( )
执行右面的程序框图,若p=0.8,则输出的n=( )