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单选题
While you do each step of the valve test, make sure that there is no leakage. Calculate the quantity of fuel necessary.
A
As you do the valve test, make sure that there is no leakage. Release the quantity of fuel needed.
B
While you do each step of the valve test, make sure that there is no leakage. Concern the quantity of fuel necessary.
C
As you do the valve test, make sure that there is no leakage. Assess the quantity of fuel needed.
答案解析
正确答案：C
