问题
单项选择题
The valves（）S/0 No.187 is not shown in the plan.
A.below
B.in
C.of
D.under
答案
参考答案：D
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The valves（）S/0 No.187 is not shown in the plan.
A.below
B.in
C.of
D.under
参考答案：D