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单选题
The portion of the system which is classified as auxiliary, emergency or standby, and which is used to supplement or take the place of the main hydraulic system.
A
The portion of the system which can be divided into three parts: auxiliary, emergency or standby, and which is equally important to the main hydraulic system.
B
The portion of the system which is used as an auxiliary section in emergency or standby situations, and which cannot be used as a supplement and replacement of the main hydraulic system.
C
The portion of the system which can be called in different names: auxiliary, emergency or standby. And if the main hydraulic system malfunctions or fails, this portion of the system can be used.
答案解析
正确答案：C
