题目内容

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

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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

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爱情的基本特征有哪些？

在额定频率为50HZ时，电压负荷箱在额定电压的（）的范围内，周围温度为（）时，其有功部分和无功部分的允许误差均不得超过（）。