A、 Because of the risk of contamination, you must do this task in a very clean environment.
B、 To prevent environmental pollution, this task must be done in a very clean area.
C、 In order to prevent contamination, the task you must do is to find a very clean environment.
答案：A
A、 Because of the risk of contamination, you must do this task in a very clean environment.
B、 To prevent environmental pollution, this task must be done in a very clean area.
C、 In order to prevent contamination, the task you must do is to find a very clean environment.
答案：A
A. STE是一种活的语言，需要用户的反馈来不断改进。
B. STE是一种生活的语言，需要用户的培育来不断验证。
C. STE是一种活的语言，需要用户的输入来不断应用。
A. Each door has flexible seals at its structure interface which protect the metal interfaces from damage by the airflow.
B. Each door has flexible seals at its structure interface which protect the metal interfaces from no damage by the airflow.
C. Each door has formalist seals at its structure interface which protect the metal interfaces from damage by the airflow.
A. Obtain approval from the design authority after making any changes to this repair procedure.
B. Prior to modifying this repair procedure, obtain the approval of the design authority.
C. Ensure that the design authority approves nonessential alterations made to this repair procedure.
A. 数据应以标准日（ISA）的时间、燃料和从海平面爬升的距离与海拔高度的关系来表示。
B. 数据应能够呈现标准日（ISA）的时间、燃料和从海平面爬升的距离与海拔高度的关系。
C. 数据应显示国际标准大气(ISA)条件下飞机从海平面爬升到某高度所需的时间、燃油消耗量和水平距离。
A. 找到新的故障件。
B. 发现新的排故方法。
C. 找到新的排故程序。
A. The form of the climb performance presentation is decided by the airplane manufacturer.
B. The format of the cruise performance presentation is at the discretion of the airplane manufacturer.
C. The form of the cruise performance presentation is at the discretion of the airplane manufacturer.
A. 点火部分包括感应振荡器、磁电机、开关、主过滤器、分配器、线束、火花塞、点火继电器、激励器和提前点火的电气部分。
B. 点火部分包括感应振动器、磁电机、开关、铅过滤器、分配器、线束、插头、和火花提前的电气部分。
C. 点火部分包括感应振动器、开关、铅过滤器、分配器、线束、插头、点火继电器、激励器和火花提前的电气部分。
A. This commonality requires greater learning and understanding for pilots, aircraft maintenance technicians and engineers alike.
B. This commonality makes it easier for pilots, aircraft maintenance technicians and engineers alike to learn and understand.
C. This commonality brings about better learning and understanding of the pilots, aircraft maintenance technicians and engineers alike.
A. Refer to chapter 6 for instructions on how to park the aircraft in bad weather conditions.
B. Chapter 6 instructions are referred to how to park the aircraft in bad weather conditions.
C. Referring to chapter 6 to park the aircraft in bad weather conditions.
A. Make an estimate of the necessay quantity.
B. Make a record of the necessary quality.
C. Make a note of the necessary quality.
