A. pared to the two stroke engines

B. Environmental pollution by NOx emission is much higher by four stroke petrol engines as

C. Temperature in stratosphere rises with increasing altitude

D. mical oxygen demand (C.O.D.) value

E. iation to come in but does not allow the short wavelength infra red radiation to escape out

F. Biological oxygen demand (B.O.D.) value of a sewerage sample is always lower than its