问题
单项选择题
A combination or all-purpose nozzle produces（）.
A.low-velocity fog only
B.a solid stream only
C.a solid stream and foam
D.a solid stream and fog
答案
参考答案：D
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A combination or all-purpose nozzle produces（）.
A.low-velocity fog only
B.a solid stream only
C.a solid stream and foam
D.a solid stream and fog
参考答案：D