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【多选题】
下列关于热处理的说法中，正确的有（）。A.
退火与正火主要用于钢的预先热处理，其目的是为了消除铸、锻、焊等工序所造成的组织缺陷与内应力
B.
淬火和回火必须配合使用，单独进行任何一个操作都是没有意义的
C.
化学热处理仅改变表层组织，不改变其化学成分
D.
化学热处理的方法有渗铬、渗硼、渗氮、渗碳等，但不包括渗铝
E.
对于一般铸件、焊接件以及一些性能要求不高的工件，退火与正火也可以作为最终热处理
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【单选题】Since there is no way for me to avoid exams, I am currently questioning what kind are the most taxing and ultimately beneficial. I have already sweated through numerous in-class midterms and finals, a...
A.
Elderly students find it hard to keep up with the rapid changes in education.
B.
Some believe take-home exams may affect students' performance in other courses.
C.
Certain professors believe in-class exams are ultimately more helpful to students.
D.
In-class exams are believed to discourage cheating in exams.
E.
The author was happy to learn she could do some exams at home.
F.
Different students may prefer different types of exams.
G.
Most professors agree whether to give an in-class or a take-home exam depends on type of course being taught.
【单选题】I find it very difficult to ________ the fact that two of our best students failed the exam.
A.
in large part
B.
fire off
C.
at a disadvantage
D.
account for
【单选题】Can you guess why "we" apologize?
A.
"We" think the city is not good enough as the birthplace of former president G. Bush.
B.
"We" feel sorry to have this unpopular president G. Bush who was born in this city.
【简答题】response transform focus yze estimate competitive compensate adopt typical regulate keep up with set up fire off take the lead add to stand out ...
【单选题】---What should we do since we can’t make a compromise after lengthy talks？ --- ____ you apologize and take back what you’ve said _____ it is all over between us.
A.
Either; or
B.
Not only; but also
C.
Neither; nor
D.
Whether; or
【简答题】Many Chinese students find it difficult to learn English, but not Chinese, because Chinese is their mother language. In fact Chinese is much more difficult to 1 than English. Still some students in ot...
【单选题】We don’t doubt ________ the boy can ________ the angry teacher.
A.
if; apologize for
B.
whether; apologize to
C.
that; apologize to
D.
what; apologize
【多选题】I have no _a place to stay. In fact it was surprisingly easy.
A.
difficulty to find
B.
difficulty finding
C.
trouble to find
D.
trouble finding
【单选题】We apologize for the delay inprocessing _____loan application.
A.
you
B.
your
C.
yourself
D.
yours
【单选题】We would like () to apologize to all patients who are kept waiting for any length of time.
A.
taking this opportunity
B.
to take opportunities
C.
to take this opportunity
D.
taking opportunities
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