问题
单项选择题
What is meant by spotting the boom?（）
A.Lowering it into a cradle
B.Placing it in a desired position
C.Spotting it with wash primer and red lead
D.Two-blocking it
答案
参考答案：B
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What is meant by spotting the boom?（）
A.Lowering it into a cradle
B.Placing it in a desired position
C.Spotting it with wash primer and red lead
D.Two-blocking it
参考答案：B