多項(xiàng)選擇題
A.氫氧化鈉; B.碳酸鈉; C.碳酸氫鈉; D.水玻璃
單項(xiàng)選擇題
A.5mm; B.8mm; C.10mm; D.12mm
A.10mm B.30mm C.20mm D.25mm
A.1.2379 B.1.2333 C.1.2769S D.1.7140
A.正轉(zhuǎn) B.反轉(zhuǎn) C.先正轉(zhuǎn)再反轉(zhuǎn) D.先反轉(zhuǎn)再正轉(zhuǎn)
A.-48 B.-58 C.-68 D.-78
A.3mm B.4mm C.5mm D.6mm
A.粗牙螺紋M; B.細(xì)牙螺紋MF; C.管螺紋BS
A.Cr5MoV B.Cr12Mo C.7CrSiMnMoV D.4CrMnSiMoV
A.5 B.10 C.15 D.20
A.40毫米 B.10毫米 C.20毫米 D.30毫米