（ ）没有端点，可以向两端（ ）。
直线；无限延伸
富氧鼓风冶炼特征？
Vessels should not anchor or trawl in the vicinity of pipelines and are（）.in the pipeline area shown on the chart.
A.prohibit to anchor
B.prohibited to anchor
C.not to anchor
D.prohibited from anchoring
