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用青霉素治疗下列疾病的过程中，首剂肌注后可出现赫氏反应的是（）

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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。

A. 正确
B. 错误

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

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