皮皮学，免费搜题
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搜题
【判断题】
莱氏体是共晶转变的产物,是奥氏体和渗碳体的机械混合物。A.
正确
B.
错误
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Based on the timeline, when do you think the steam engine was invented?
A.
in the 1600s
B.
in the 1700s
C.
in the 1800s
D.
in the 1900s
E.
in the 2000s
【单选题】_____ foreign friends come to visit China every year. [ ]
A.
Many thousand
B.
Thousands of
C.
Many thousand of
D.
Many thousands
【单选题】Every year, _____ fishes are killed by the polluted water and many people are made sick by the polluted air. [ ]
A.
thousand of
B.
thousands of
C.
two thousands
D.
two thousands of