混合是将大块物料破碎成较小的颗粒或粉末的操作过程。
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A __ is helpful in looking for a job, but it doesn’t mean a job.
A. certificate
B. grade
C. record
D. debt
If you think getting a certificate means getting a job, you are __ yourself.
A. keeping
B. having
C. cheating
D. doing
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