A．螺紋代號(hào)－螺紋公差帶代號(hào)－螺紋旋合長(zhǎng)度代號(hào)
B．螺紋代號(hào)－螺紋公差帶代號(hào)
C．螺紋代號(hào)－螺紋旋合長(zhǎng)度代號(hào)
D．螺紋公差帶代號(hào)－螺紋代號(hào)－螺紋旋合長(zhǎng)度代號(hào)

A．多線螺紋導(dǎo)程Ｌ等于螺距Ｐ除以線數(shù)ｎ
B．同一條螺旋線上相鄰兩牙對(duì)應(yīng)點(diǎn)間的軸向距離稱為導(dǎo)程
C．單線螺紋導(dǎo)程Ｌ等于螺距Ｐ
D．螺紋上相鄰兩牙對(duì)應(yīng)點(diǎn)間的軸向距離稱為螺距