654、设计机构必须批准对修复方案的更改

the design authority must report all related questions about the repair plan

The design authority must give approval to changes that you make to the repair scheme

The design authority may reply the work that you will do according to the scheme

正确答案：B

834、Do not make a recess of more than 2mm for the studs.

833、Do a continuity check at the Alternate Exhaust Fan Receptacle.

832、Descriptive Data shall be supplied for standard and optional engine and propeller installations and fuel and oil systems

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