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【单选题】
形状复杂,精度较高的刀具用的材料是 。A.
工具钢
B.
高速钢
C.
硬质合金
D.
碳素钢
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举一反三
【简答题】When will the watch finally be ready?
【单选题】—A number of children ______ standing outside the office when I got there. —The number of the children______ 16. [ ]
A.
is; are
B.
is; is
C.
are; is
D.
are; are
【单选题】—Could you tell me ________? —By telling them some funny stories. [ ]
A.
when I can visit the children
B.
why the children are not happy
C.
where the children want to go
D.
how I can cheer up the sick children
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