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【单选题】
在燃烧过程中，当燃气喷离火的速度小于燃烧速度时，火焰就会缩入燃烧器内部， 形成( )，这种现象称为“回火”。A.
熄火现象
B.
过度燃烧
C.
不完全燃烧
D.
急速燃烧
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【单选题】Do you know the man ___ is talking with your father?
A.
whose
B.
who
C.
which
D.
what
【单选题】Do you know the man ___ is talking with your father?
A.
whose
B.
who
C.
which
D.
where
【单选题】Do you know the man ________ your father nodded ?
A.
whom
B.
to whom
C.
to who
D.
about whom
【简答题】Do you know the man ________ your brother writes? (your brother writes to the man)
【简答题】对加工精度影响较大的机床精度主要有机床主轴回转误差、 误差和传动链误差。为了减小传动链误差,传动系统通常采用(升或者降) 速传动。
【单选题】We all know he is an honest man; I don't understand why you _____ him of stealing your money. [ ]
A.
charge
B.
suppose
C.
consider
D.
suspect
【单选题】—Do you know the man ______ i s talking with your father? —Yes, he’s our head teacher. [ ]
A.
whom
B.
which
C.
what
D.
who
【简答题】How do you know that your computer is infected? You know it by______________ your computer for virus with a software program.
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