在水工图中，将视向顺水流方向所得到的立面图称为什么？ In the hydraulic diagram, what is the elevation projecting from the flow direction called？
A．上游立面图upstream elevation
B．下游立面图downstream elevations
C．合成视图synthetic view
D．纵剖视图 longitudinal cutaway view
判断题水工图中，顺水流方向的正视图称上游立面图，逆水流方向的正视图称下游立面图。A 对B 错
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