平行线间的单渡线,由两组相同号数的单开道岔和两道岔间的连接直线组成。
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A power-driven fishing vessel is underway on the high seas and is not engaged in fishing. Which of the following factors determines what lights she will show?().
A. Whether she is normally a fishing or a trawling vessel
B. Her gross tonnage
C. Her length
D. The type of gear she carrie
Which of the listed types of files is the best for producing a fine finish on metal?()
A. Mill
B. Float
C. Warding
D. Second cut