1.19 If a better material had been used the efficiency of the machine ( ) much increased.○ would have been ○ has been○ had been ○ will be

[单选题]This used piston had been tested and approved as a spare part by the （） during last annual repair.A . agentB . shipchandlerC . surveyorD . engineer

[单选题]______ that my head had cleared, mybrain was also beginning to work much be

If the wounded soldier had been given first _____ , he would not have died.A. he

[单选题]If the streets had been clearly marked， it would( )us so long to his house.

So much had changed, so many things had been______, and we tried so very hard to

[主观题]The machine was used for__________ (cut) the metal．

[单选题]If ignited，which material would be a class B fire?（）A . MagnesiumB . PaperC . WoodD . Diesel Oil

As graduation day approached， excitement increased． Being out of high school mea

Indeed it has been pointed out that without depression we would_much of the worl

[单选题]The ratio of the work done by the machine_____the work done on it is called