已知在矩形ABCD中,相邻两边的长分别为6和8,则矩形ABCD的一条对角线的长等于______.
∵矩形相邻的两边长分别为6和8,
∴对角线=62+82=10.
We are now enjoying the cool air in the room. ____, the farmers are harvesting crops in the hot sun.
A.Therefore
B.Besides
C.As a result
D.In the meantime
造成高频振荡器频率不稳的原因有哪些?