The sealant burns at 109 deg. F.

A. 这种调整的正确性很重要。

B. 这种更改的正确性很重要。

C. 这种正确的调整是很重要的。

A. 需要提供紧急程序。

B. 应提供紧急下降程序。

C. 紧急下降时提供应急程序。

A. 如果起落架门是做为一个内部结构，它们只能显示在第32章。

B. 如果起落架门是做为一个整体结构，它们只能显示在第32章。

C. 如果作为一个内部结构，起落架门只能显示在第32章。

A. 转动凸轮以松开管路。

B. 转动卡箍以使管路自由移动。

C. 转动卡箍以松开管路。

A. 副翼回到中立位后，确保它们与襟翼齐平。

B. 副翼回到初始位后，确保它们与缝翼垂直。

C. 襟翼移动到中立位后，确保它们与缝翼齐平。

A. 作对比的代词和把“more”和“most”作为最高级的代词在字典中不会列出这些形式，因为“more”和“most”也列出了批准的词。

B. 以“more”和“most”作比较级和最高级的形容词不会在字典中列出这些形式，因为“more”和“most”也被列为批准词。

C. 有比较级和最高级的副词由“more”和“most”构成，不会被收录在词典中，因为“more”和“most”也列出了被允许的词。

A. Manufacturers＇ recommended time limits, maintenance checks and inspections (both planned and unplanned) are arranged in Chapter 5.

B. Manufacturers＇ recommended time limits, maintenance checks and tests (both scheduled and unscheduled) are arranged in Chapter 5.

C. Manufacturers＇ recommended time limits, maintenance checks and inspections (both scheduled and unscheduled) are arranged in Chapter 5.

A. The purpose of radar is to obtain, process and display image information.

B. Grasping, processing and displaying grafic information is the function of radom.

C. The purpose of radar is to transmit, process and caculate image information.

A. Schematic diagrams may be used to indicate "flow" and to illustrate the operation of systems such as air control, electrical, fluid power, fuel and turbosystems.

B. Principle charts can be intended to show "flow" and explain the operation of systems as well as air control, electrical, hydraulic power, fuel and turbine systems.

C. Schematic diagrams can be employed to show "flow" and to explain the operation of systems along with air control, electrical, fluid power, fuel and turbosystems.

A. The accuracy of the adjustment can vary.

B. The accuracy of the adjustment can be fixed.

C. The precision of the adjustment can be prevented .