8. 噴凝土之施噴作業中,噴嘴須儘可能與施工面保持幾度?
(A)0
(B)45
(C)60
(D)90
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統計: A(2), B(33), C(13), D(197), E(0) #3000904
統計: A(2), B(33), C(13), D(197), E(0) #3000904