问题
单项选择题
A carburetor is required to have a safety device called a(n)（）.
A.pressure release
B.backfire flame arrestor
C.automatic shut off
D.flow valve
答案
参考答案：B
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A carburetor is required to have a safety device called a(n)（）.
A.pressure release
B.backfire flame arrestor
C.automatic shut off
D.flow valve
参考答案：B