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【判断题】
—般数控机床主要由控制介质、数控装置、伺服机构和机床四个基本部分组成。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【简答题】ZX5系列弧焊电源的外特性是________,通过调节____________________来调节外特性。
【单选题】当柴油需要掺兑时,-10号和-20号柴油各50%掺兑后,其凝固点是( )。
A.
-15号柴油
B.
-13 ~ -14号柴油
C.
-16 ~ -17号柴油
D.
不确定
【单选题】Why does the woman say this:
A.
She is worried that she cannot afford the service.
B.
She is trying to negotiate the cost of the sessions.
C.
She is showing particular interest in the man.
D.
She is expressing surprise about the arrangement.
【单选题】—Where is Lucy? —I can’t say where she is, but she have gone to meet her classmates, for they want to go to Sichuan to work as volunteers.
A.
can
B.
should
C.
must
D.
may
【单选题】When Sara was sick, her voice was almost inaudible . We couldn ’ t clearly hear what she was trying to say.
A.
Very loud
B.
very soft
C.
very shy
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