The defective place in the furnace should be () with fire bricks.
The defective place in the furnace should be () with fire bricks.
Defective governor in a diesel engine may lead to ().
Defective atomizer in a diesel engine will lead to().
Defective governor in a diesel engine may lead to ().
Defective atomizer in a diesel engine will lead to().
条件缺损病毒(coditionally defective viruses)