简述“Al-Cu-Mg”变形铝合金组织特点、性能特点？

—When will you come to see me, Dd —I will go to see you when you __________ the trining course.—When will you come to see me, Dd —I will go to see you when you __________ the trining course.finish B．re finished C．will finish D．re finishingA．finishB．are finishedC．will finishD．are finishing

I’d like to see you offt theirport. Could you tell me _____ when your plne took offB．when diI’d like to see you offt theirport. Could you tell me _____ when your plne took off B．when did your plne tke off C．when your plne tkes off D．when does your plne tke offA．when your plane took offB．when did your plane take offC．when your plane takes offD．when does your plane take off

A、120×8÷5－2
B、120÷(8×5)－2
C、120÷4×5－2
D、120×5÷4+2