--I . By the time I got outside, the school bus had already left.
A:oversleep
B:overslept
C:sleep
D:slept
通电分解36g水,可得到氢气多少升?(标况下氢气的密度为0.09g/L)。
根据典故写出相应的战役。
①退避三舍:____
②纸上谈兵:____
③围魏救赵:____