题目内容

滚齿的齿面粗糙度受影响的四种情形及措施，撕裂，选择均匀的齿轮材料及合适的热处理，合理选择（），加强冷却效果

A. 插齿刀
B. 模数
C. 切削用量
D. 齿数

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When landing a lifeboat through heavy surf with a strong current running parallel to the beach (from right to left when facing from seaward) the recommended procedure is to（）.

A. approach while coming to the left to take advantage of the current
B. drop an anchor outside the surf line，then pay out anchor line over the bow while the seas carry the boat toward the beach
C. approach slow enough so that the boat can be brought around to meet breaking seas on the bow
D. rig a drogue with tripping line over the bow，back ashore with drogue tripped between breaker

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