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车床变速箱传动齿轮工作中承受一定的弯曲、扭转载荷及冲击力，速度中等，现选用45钢制造，其热处理技术条件为：调质，230～280HBW；齿表面，高频感应加热表面淬火，50～54HRC，试确定加工工艺路线，并指出热处理的目的。
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反馈参考答案：
举一反三
【单选题】We received a typewritten letter with by hand.
A.
note adding
B.
a note added
C.
note added
D.
a note adding
【简答题】根据下列选项，回答 43～44 题： 第 43 题 “夫医者，非仁爱之士不可托也，非聪明达理不可任也，非廉洁淳良不可信也。”是说我国古代医生择徒甚严，此话出自（ ）
【简答题】We received a letter _____ that he would arrive soon.A. in effect B. off effect C. into effect D. A.to the effect
【单选题】— So far _____. — That's too bad. [ ]
A.
we received no letter from him
B.
he haven't send us any message
C.
nothing from him has been received
D.
we won't hear from him
【单选题】We received a typewritten letter with a note added ( ).
A.
on hand
B.
by hand
C.
with hand
D.
in hand
【简答题】请根据以下内容回答 45～46 题： 第 45 题 “夫医者，非仁爱之士不可托也，非聪明达理不可任也。非廉洁淳良不可信也。”是说我国古代医生择徒甚严，此话出自（ ）
【单选题】We received a letter from him ________.
A.
recent
B.
recently
C.
recence
D.
meanwhile
【单选题】(143～144题共用备选答案) “夫医者，非仁爱之士不可托也，非聪明达理不可任也，非廉洁淳良不可信也。”是说我国古代医生择徒甚严，此话出自
A.
孙思邀
B.
白求恩
C.
张仲景
D.
希波克拉底
E.
杨泉
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