A. Bookkeeg system
B. Ledger system
C. Balance check
D. General journal system
A. Hydrogen sulphide
B. Carbon dioxide
C. Methane
D. Oxygen
A. 1000
B. 2100
C. 2700
D. 10,000
E. 21,000.
A. Are water seals which prevent the entry of foul gases
B. Are used to trap the rats entering sewers
C. Dissolve the foul gases
D. Create symphonic action to increase the quick disposal of sewerage
A. higher than the surface of liquid
B. the same as the surface of liquid
C. lower than the surface of liquid
D. unpredictable
E. none of the above
A. 500 kg
B. 1000 kg
C. 1500 kg
D. 2000 kg
E. 4000 kg
A. 5 – 10 years
B. 15 – 20 years
C. 30 – 40 years
D. 40 – 50 years