单项选择题
A.3% B.2% C.1.5% D.1%
A.10% B.2% C.0.5% D.0.3%
A.150° B.120° C.90° D.80°
A.电缆射孔 B.过油管射孔 C.油管输送射孔 D.负压射孔
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