导入塑化液时，器械进入的深度为
A．不进入根管
B．达根尖1/3
C．达根尖1/2
D．达根尖孔
E．超出根尖孔
参考答案：B
It was for the first time that the two countries ______ an agreement.
A．reached
B．have reached
C．had reached
D．will reach
应急救援演习分室内演习和（）演习。
