单项选择题
A.variable injection timing
B.variable inlet tonnage
C.vertical incoming tonnage
D.vertical inlet tank
单项选择题 Under manoeuvring condition the main engine may run on （）.
单项选择题 Two-stroke engine turbocharging is achieved by two distinct methods, （） termed the constant pressure and the pulse system.
单项选择题 Turbocharging system may be designed to operate on either the （） or the constant pressure exhaust system.