皮皮学，免费搜题
登录
搜题
【多选题】
下列开挖方法黄土隧道可以采用的有A.
全断面法
B.
台阶法
C.
三台阶弧形导坑法
D.
双侧壁导坑法
E.
CRD法
拍照语音搜题，微信中搜索"皮皮学"使用
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】Economics proceeds by making models of ( ), which are simplified representations of reality.
A.
social phenomena
B.
people’s imagination
C.
stories
【单选题】Economics models __________________.
A.
are used as detailed representations that include all aspects of an environmental issue
B.
can be useful for creating solutions to environmental problems if the assumptions are accurate
C.
are likely to produce the same conclusions about environmental issues despite changes in the model's assumptions
D.
can be used to create accurate and concise representations of environmental problems
相关题目：