A benched excavation is generally used
A) on tight downtown sites.
B) where dewatering of the site is not required.
C) where the excavation depth is less than 5 ft.
D) on open suburban sites.
D) on open suburban sites.
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Most heat pumps have two metering devices because:
A) Two metering devices allow two stage operation. B) Each coil must function as the evaporator during one of the cycles. C) Two metering devices allow for extra refrigerant flow at low outdoor temperatures. D) One metering device serves as a backup to the primary metering device.