Exhaust temperature increases in all cylin
题型：单项选择题
问题：
Exhaust temperature increases in all cylinders, the possible cause may be（）
(1) increased scavenging air temperature
(2) air in fuel pumps and fuel valves
(3) fouling of air and gas passages
A.(1)+(2)
B.(1)+(3)
C.(2)+(3)
D.(1)+(2)+(3)
方向相一致的就位道，义齿垂直向就位