單項(xiàng)選擇題

六缸發(fā)動(dòng)機(jī)大修安裝曲軸時(shí)，主軸承蓋應(yīng)對(duì)號(hào)安裝，不得調(diào)換；主軸承蓋螺栓齊全、完好。按規(guī)定扭矩分三次緊固，緊固順序?yàn)椋海ǎ?/h4>

A.4-3-5-6-2-1-7
B.4-2-5-6-3-1-7
C.4-3-1-6-2-5-7
D.4-3-2-6-5-1-7

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