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【单选题】
20钢粗加工使用()硬质合金刀具。A.
YT15
B.
YT30
C.
YG3
D.
YG8
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反馈参考答案：
举一反三
【单选题】No one left here yesterday, ________?
A.
didn’t they
B.
did he
C.
didn’t one
D.
did one
【单选题】— Is there _____ fruit shop near here? — Yes, there's _____ near here. [ ]
A.
a; the
B.
the; a
C.
a; one
D.
one; a
【单选题】No one left here yesterday, ________?
A.
didn't they
B.
didn't one
C.
did they
D.
did one
【单选题】No one left here yesterday, ________?
A.
didn't they
B.
did they
C.
did one
D.
didn't one
【单选题】关于膈的描述错误的是( )
A.
位于胸腹腔之间
B.
止于中心腱
C.
膈上有三个裂孔，分别为主动脉裂孔、食管裂孔、腔静脉孔
D.
膈为主要的呼吸肌
E.
其薄弱区为中心腱
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