When does the new law come into operation？（英译中)

When does auxiliary burner of incinerator put into operation？ Istart incinerator when it i

We should obey the law.（英译中)

Some people objected that the new tax law was unfair.（英译中)

When does the birthday party take place？（英译中)

When does the new system go into effect？A．Immediately.B．From next week.C．From next month.D

A completely new situation will____when the examination system comes into existence.[ ]A. riseB. ari