A typical ______ uses 20 litres of water a minute.
A. power shower
B. simple shower
C. bath
【39】
A. alternatives
B. decisions
C. solution
D. suggestions
【34】
A. proofs
B. effects
C. solutions
D. uncertainty
Heat exchangers
A. recover up to 90% of heat that would otherwise be lost.
B. recover over 90% of heat that would otherwise be lost.
C. are difficult to use.
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