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【判断题】
透视图是用平行投影法将物体投射在单一投影面上所达到的图形。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】I ( ) my hometown for a long time. I really miss it.
A.
went away from
B.
have been away from
C.
have left
D.
have been left
【简答题】（）阀的主要作用是控制油液的流动方向，使其单向流动。
【单选题】I my hometown for a long time. I really miss it.
A.
left
B.
went away from
C.
have been away from
【简答题】单向阀的主要作用是控制油液的（）向流动。
【单选题】I ____ back my hometown for a couple of years. I miss it a lot.
A.
have gone
B.
haven’t gone
C.
have been
D.
hasn’t been
参考解析：
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