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
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
刨削松木时，常有树脂粘结在台面和辊筒上，阻碍了工件的进给。为了提高进给速度和加工质量，保证正常生产，在工作中应经常在台面上擦拭（）进行润滑。
A. 汽油
B. 煤油
C. 食物油
D. 橄榄油
记忆可以分为（）
A. 感觉记忆
B. 短时记忆
C. 长时记忆
D. 瞬时记忆
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