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【多选题】
剖切面的种类包括( )。A.
单一剖切面
B.
几个平行的剖切面
C.
几个相交的剖切面
D.
斜剖
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知识点：
皮皮学刷刷变学霸
举一反三
【简答题】中国古代的城市叫作“城池”，“城”是指城墙，“池”是指（）
【单选题】What does the author mean by saying 'put the earth at the top of their agenda' in the beginning sentence of the passage?
A.
The author intends to discuss the issue of global warming with top government leaders.
B.
The author lays stress on the research of the climate of the earth.
C.
The author attaches paramount importance to the protection of the earth's environment.
D.
The author considers the relation between automating and environmental pollution.