657、使用孔探仪从内部检查燃烧室

Use a hole instrument to examine the turbine internally

Use a borescope to examine the combustor internally.

Use a hole instrument to examine the combustor externally.

正确答案：B

831、Corrosion inhibiting compound may be present in corrosion susceptible locations.

830、Corrosion can have a lot of causes

829、Complex sentence structure and the large number of meanings and synonyms that many English words have can causeconfusion.

828、Calculate the thickness of the shim as follows: t=f x-y s

827、Be careful when you move jet pipes or exhaust cones that have insulating blankets.

826、Basically, writers can use the approved words in the dictionary as core vocabulary.

825、Apply sealant on the outer surface

824、Always keep the brightness control on the LCD display at maximum.

823、All two bracket holes must align with the fuel tube.

822、A small child should use an approved child restraint seat