503 、 The two most common types of engines used in helicopters are the reciprocating engine and the
turbine engine.

A. 　 The emergency procedures check list should be in concise, abbreviated form designed to remind pilots of
items to check without providing details concerning the operation of any system.

B. 　 The normal procedures check list which should be in concise, abbreviated form is designed to tell pilots of
items to check without providing details concerning the operation of any system.

C. 　 The content of the emergency procedures check list should be in concise, abbreviated form and its
purpose is to remind flight attendants of items to check with providing details concerning the operation of
any system.

A. 　 Oxidation occurs very easily

B. 　 Oxygen occurs very easily.

C. 　 Nitrogen occurs very easily.

A. 　 The Federal Aviation Regulations 'require "maximum continuous power.to be used during airframe and
engine combination certification to show obedience with certain criteria.

B. 　 Federal aviation regulations require "maximum continuing power" to be used during the certifying of the
airframe and engine to meet certain criteria.

C. 　 Federal aviation regulations,
"maximum continuous power", are used to show compliance with certain standards.

A. 　应明确指出与其他系统的互连。

B. 　应正确指出与其他系统的联系。

C. 　应注明与其他系统的关系。

A. 　 Discard the removed fasteners.

B. 　 Throw away the removed components.

C. 　 Leave out the removed gaskets.

A. 　如果你发现了凹坑,做适用的维护程序

B. 　如果你发现了划痕,做具体的修理工作

C. 　如果你发现了裂痕,做适用的修理程序

A. 　避免使用这些词来表达他们论证过的意思。

B. 　一定要使用这些词的批准的意思。

C. 　一定要用这些词来表达他们认可的方法。

A. 　 A number in the bottom left corner of the display means a related page.

B. 　 A number in the top left corner of the display refers to a related page.

C. 　 A number in the top left corner of the display is the irrelevant page.

A. 　安装前先润滑密封件。

B. 　安装前先把润滑油进行密封。

C. 　在设备前面密封润滑油

A. 　 The flight deck is located between the pressure/dome/and the front passenger door, and it is above the
floor.

B. 　 Cockpit is on the floor panel and bet ween/the/pressure dome and the rear passenger partition.

C. 　 Flight compartment is above the floor and between/the forward passenger partition and the forward
pressure dome.