问题
单项选择题
The brickwork surrounding the firebox of a boiler is known as（）.
A.refractory
B.the screen wall
C.the water wall
D.fire plate
答案
参考答案：A
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The brickwork surrounding the firebox of a boiler is known as（）.
A.refractory
B.the screen wall
C.the water wall
D.fire plate
参考答案：A