1207. 在操作地面测试设备之前,确保压力调节器设置为零。( )

　If you perform the ground test unit, ensure that pressure regulator is turned to Zero.

　Before you do the ground test, make sure that you have set the pressure regulator to Zero.

　Before you operate the ground test unit, make sure that the pressure regulator is set to zero.

正确答案：C

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