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【多选题】
对主偏角描述正确的是?A.
主切削刃在基面上的投影与进给运动速度vf 方向之间的夹角。
B.
小的主偏角降低切削刃单位长度上的切削负荷，加强了刀尖，增大了散热面积，使切削条件得到改善，刀具寿命提高
C.
大的主偏角降低径向分力，减小工件的变形
D.
加工刚性差的材料选择小的主偏角
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反馈参考答案：
举一反三
【单选题】维持子宫在正常位置，是由( )
A.
膀胱和直肠的支撑
B.
盆底肌肉及其上下筋膜支撑
C.
子宫4对韧带的作用
D.
腹腔压力作用
E.
子宫4对韧带及盆底肌肉、筋膜的支托作用
【简答题】听录音，选择你听到的句子。 ( ) 1. A. What are you going to do on the weekend? B. What are you going to do on Saturday morning? ( ) 2. A. I' m going to take a trip. B. I' m going to the cinema. ( ) 3. A...
【简答题】给下列的问句选择合适的答语。 ( ) 1. What are you doing? ( ) 2. What is he doing? ( ) 3. Where is he going? ( ) 4. What is Amy doing? ( ) 5. Are they dancing? A. He is drawing pictures. B. No, th...
【简答题】订算题. 1. What number should replace the question mark? Answer:________________________________________________________ 2. Eric is five years younger than his sister. Five years ago, his age was l/6 0f ...
【简答题】What does packing mark include?
【单选题】你是否掌握相机感光度的作用与设置?
A.
掌握得非常好，课堂上不需要再讲
B.
掌握一部分，忘记了一部分，课堂上可以再讲一讲，加以巩固
C.
了解一点，不是太深入，课堂上需要讲，加以巩固
D.
完全不了解，要从0学起
【简答题】单句改错。 1. What are you going to do that? 2. Bob wants to be a actor when he grows up. 3. Jim is going to' move interesting somewhere. 4.I'm going to retired at the age of sixty. 5. Tom is going to get ...
【简答题】What number replaces the question mark?
【简答题】What dose packing mark include?
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