问题
单项选择题
The outlet at a fire hydrant may be positioned anywhere from horizontal to pointing（）.
A.45°upward
B.vertically upward
C.vertically downward
D.all of the above
答案
参考答案：C
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The outlet at a fire hydrant may be positioned anywhere from horizontal to pointing（）.
A.45°upward
B.vertically upward
C.vertically downward
D.all of the above
参考答案：C