67、This is the minimum concentration of flammable vapors in air below which propagation of flame does
not occur on contact with a source of ignition. 这是空气中可燃蒸汽的最低浓度,低于此浓度时,与火源接
触时火焰不会传播。

A. 　使用“降低”更好,因为他描述的是压力,而不是控制压力的指示器

B. 　使用“降低”更好,因为它描述的是压力,而不是监测压力的显示器

C. 　使用“增加”更好,因为它描述的是压力,而不是监测压力的显示器

A. 　应描述系统中每个组件的功能、操作以及位置。

B. 　系统中每个组件的目的、操作应和位置一样被描述。

C. 　系统中每个组件的功能和构成应被描述得和位置一样好。

A. 　 Assemble the movable car7beforeayou lift the gearbox.

B. 　 Assemble the movable hoist before you lift the gearbox.

C. 　 Assemble the movable handle -before you lift, the gearbox

A. 　油门杆的快速移动将引起喘振。

B. 　节流阀的快速运动将造成抽吸现象。

C. 　快速移动节气门将造成通气。

A. 　 this system does not exceed the normal channels of communication for items not included in the CAP

B. 　 For items not included in the CAP this system does not take the place of the normal channels of
communication

C. 　 For items not mentioned in the CAP this system does not occupy the normal
channels of communication

A. 　防腐剂可能存在于腐蚀严重的部位

B. 　腐蚀敏感的部位可以安装防腐组件。

C. 　易受腐蚀的部位可能有防腐剂。

A. 　对 2 号引擎进行排故。

B. 　对 2 号发动机进行大修。

C. 　对 2 号发动机进行校验。

A. 　确保杆之间有合适的间隙。

B. 　确保杆之间有合适的角度。

C. 　确保杆之间有足够的间隙。

A. 　 When the temperature is below zero, depressurize the water system.

B. 　 If the temperature drops below zero, deflate the water system.

C. 　 If the temperature decreases to less than zero, drain the water system.

A. 　 The compressing of the spring can cause the valve to open.

B. 　 There is no change of the valve when the spring compresses.

C. 　 After compressing of the spring, the valve goes to closed position.