题目内容

The frequency of an alternator at a given RPM is determined by the ______.

A. number of turns of wire in the armature(电枢) coil
B. number of magnetic poles
C. strength of the magnets used
D. output voltage

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“ソ”的平假名是“そ”。()

Stern tube and strut(支柱) bearings lined with hardwood or rubber composition materials are lubricated with______.

A. saltwater
B. graphite(石墨)
C. light lubricating oil
D. heavy lubricating oil

This certificate was issued________the provisions.

A. according to
B. with
C. for
D. below

________amplify(详述)charted detail and contain information needed for safe navigation.

A. Sailing Directions
B. List of Lights
C. List of Signals
D. Notices to Mariners