题目内容
(请给出正确答案)
[单选题]
选用Φ6mm的纯铜管制作喇叭口时,一般情况下,其喇叭口外径应为()。
A.9mm
B.10mm
C.12mm
D.14mm
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A.9mm
B.10mm
C.12mm
D.14mm
A.0.05~0.25mm
B.0.05~0.35mm
C.0.05~0.45mm
D.0.05~0.55mm