单项选择题
Modem engines make use of exhaust gas driven turbo-chargers to supply pressurized fresh air for （） and supercharging.
A.scavenging B.starting C.cooling D.blowing
单项选择题 Modem engines （） exhaust gas driven turbo-chargers to supply pressurized fresh air for scavenging and supercharging.
单项选择题 Modern engines （） exhaust gas driven turbo-chargers to supply pressurized fresh air for scavenging and supercharging.
单项选择题 Measure （） by means of lead wire.
