单项选择题
A.rise quickly
B.rise slowly
C.drop quickly
D.drop slowly
单项选择题 Continuous surging of turbocharger can be caused by（） ①crash stop of engine ②increased back pressure after T-Ch ③fouled or damaged turbine nozzle ring
单项选择题 When occurring a fire in the scavenge air box, the following measures should be taken except for（）
单项选择题 On what do you depend having the air cooler of main engine chemically washed?（）