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用齿条型刀具切制标准齿轮时,齿条刀具的 线和被加工齿轮的 圆相切并作纯滚动。 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace> 31 用齿条刀具加工标准齿轮时,齿轮分度圆与齿条刀具中线 ,加工变位齿轮时,中线与分度圆 。被加工齿轮与齿条刀具相 “ 啮合 ” 时,齿轮节圆与分度圆
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【单选题】I had just gone to bed after a tiring day the phone rang loud enough to wake up the dead.
A.
as
B.
when
C.
after
D.
while
【简答题】Elsa! Wake up. Wake up. 1 (醒一醒) ! Anna, go back to 2 (睡觉). I just can't . The sky is 3 (醒着的) , so I am awake. So we have to 4 (玩) . Go play by yourself. Do you want to build a 5 (雪人) ? Come on. Come o...
【单选题】听力原文：W: I can't seem to wake up in the morning without coffee at breakfast. M: I'm just like you expect that I prefer tea. Q: What dose the man mean? (5)
A.
He seldom wakes up early.
B.
He likes coffee just as the woman dose.
C.
He needs tea to make himself awake.
D.
He doesn't usually eat breakfast.
【单选题】听力原文：W: I can't seem to wake up in the morning without coffee at breakfast. M: I'm just like you except that I prefer tea. Q: What does the man mean? (2)
A.
He seldom wakes up early.
B.
He needs tea to make himself awake.
C.
He likes coffee just as the woman does.
D.
He doesn't usually eat breakfast.
【简答题】When I wake up on summer mornings, I know I am going to my favorite place to volunteer and make a difference in someone's life just by being with him or her -- a summer school for autistic (患孤独症的)chil...
【单选题】种群数量调节有外源性因素和内源性因素。下列哪一项不是属于内源性因素()
A.
由寄生物的作用大小引起的数量变化
B.
由于个体遗传素质差异引起的
C.
由个体之间神经内分泌系统活动强弱不同引起的
D.
由于环境资源的异质性导致个体的不同而引起的数量变化
【简答题】人体通过饮水摄入的某物质受到胃肠道某些细菌的作用后，可与血红蛋白结合形成高铁血红蛋白，使其不再有输氧功能，因而可造成缺氧，严重时可引起窒息死亡该物质可能为A、氰化物 B、硝酸盐 C、氯化物 D、甲基汞 E、多氯联苯 婴幼儿特别是6个月以内的婴儿与成年人相比对该物质更为敏感，摄入过量时易患蓝婴综合征（高铁血红蛋白血症），其原因之一是婴幼儿的A、胃液的pH较成年人高，有利于该物质还原菌的生长 B、胃液...
【简答题】4 I just ________(wake) up five minutes ago.
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