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单项选择题
what does M, Tr, R mean respectively in thread marks?
A．metric thread, trapezoidal thread, sealing pipe thread
B．trapezoidal thread, sealing pipe thread,metric thread
C．trapezoidal thread, ,metric thread,sealing pipe thread
D．metric thread, trapezodial thread, sealing pipe thread
B．trapezoidal thread, sealing pipe thread,metric thread
C．trapezoidal thread, ,metric thread,sealing pipe thread
D．metric thread, trapezodial thread, sealing pipe thread
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