单项选择题 Turbocharging system may be designed to operate on either the （） or the constant pressure exhaust system.

单项选择题 Turbocharging of marine diesel engine is achieved by two distinct methods, （） termed the constant pressure and the pulse system.

单项选择题 To start the ejection process the oil feed to the centrifuge is first shut off and the oil remaining in the bowl removed by admitting （）.