單項選擇題為保證偏航小齒輪與外齒圈的嚙合良好,其嚙合間隙應(yīng)為().

A.0.2mm≤t≤0.5mm
B.0.4mm≤t≤0.6mm
C.0.5mm≤t≤0.9mm
D.0.6mm≤t≤0.9mm


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