A、 Detach the connection of the valve in the direction opposite to the flow.
B、 Detach the connection of the upstream valve.
C、 Detach the connection of the valve in the direction identical to the flow.
答案：A
A、 Detach the connection of the valve in the direction opposite to the flow.
B、 Detach the connection of the upstream valve.
C、 Detach the connection of the valve in the direction identical to the flow.
答案：A
A. This document and the applicable airplane maintenance manual(s) complement each other.
B. This document may supplement the aircraft maintenance manual(s) as appropriate.
C. This document is explanation to the airplane maintenance manual(s).
A. Hydraulic fluid has no effect on painted surfaces.
B. Hydraulic fluid has positive influence on painted surfaces.
C. Hydraulic fluid has passive influence on painted surfaces.
A. However, an “emergency” almost always entails a failure that requires to respond immediately and rapidly, for example, the situations that a total powerplant fails, the fire or smoke occurs, or the cabin are depressurized rapidly.
B. An “emergency” however, almost always causes a malfunction that requests immediate and rapid response, such as the whole powerplant failure, fire or smoke, or rapid cabin pressurization.
C. However, an “emergency” is often related to a failure that demands respond simultaneously, such as the complete failure of the powerplant, fire or smoke, or rapid cabin warming.
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, in combination of airframe and engine certification process, the use of "maximum continuous power", are used to show compliance with certain standards.
A. The description could be pronounced in the active voice.
B. Descriptive content can be written in active voice.
C. You should read it in voice as you write the descriptive text.
A. Attach the aft cargo compartment forward bulkhead central panel.
B. Mount the front cargo compartment backward bulkhead center panel.
C. Fix the aft bulkhead forward panel to the forward cargo component.
A. Put sealant around each screw hole.
B. Seal each screw hole.
C. Put each screw hole into sealant.
A. The operational test of HFS-900D transceivers is an internal functions check of the HF transceiver and it is a BITE test.
B. The BITE test for the HFS-900D transceivers is the operation test that does the inner check of the HF transceiver.
C. The check of the internal functions of the HF transceiver is a BITE test related to HFS-900D transceivers.
A. This document provides supplementary information to the applicable manual.
B. This document provides primary information to the applicable manual.
C. This document provides special information to the applicable manual.
解析：这道题考察的是词语的用法和区别。在英语中，supplemental和supplementary都是形容词，意思是“补充的”，但是它们在使用上有一些区别。supplemental通常指的是在原有基础上额外提供的信息，起到弥补不足的作用；而supplementary则更强调是在原有信息的基础上进一步扩展或完善。在这道题中，正确的答案是A，因为这份文件提供的信息是对适用手册的补充，起到弥补不足的作用。
举个生动的例子来帮助理解：就好比你在学习数学的时候，老师讲解完一个定理后，给你发了一份额外的练习题，这份练习题就是supplemental information，是为了帮助你更好地理解和掌握这个定理；而如果老师给你发了一份关于定理背景知识的详细解释，那就是supplementary information，是为了让你对这个定理有更全面的了解。
A. Each of the two life vests located at L2 entry door flight crew station is damaged.
B. Each of the two life vests located at L2 entry door flight crew station is out of time limit.
C. Each of the two life vests located at L2 entry door flight crew station is out of service.
