一个长方形的周长为26㎝,如果长减少1㎝,宽增加2㎝,就可成为一个正方形,设长方形的长为x㎝,则可列方程为( )。
34. I thought it a pity __________ him to the tea party.
A.being not invited
B.not to have invited
C.to not have invited
D.not to have been invited
不宜采用塑化疗法的是()。
A.根尖孔尚未闭合的年轻恒牙
B.乳牙
C.根尖闭锁的前牙
D.A+B
E.A+B+C