单项选择题

The major source of chemical contaminants in hydraulic fluid is _____.
A.microscopic steel shavings
B.abrasive waste
C.anti-oxidant compounds
D.oxidation by-products

A.
A.microscopic
B.abrasive
C.anti-oxidant
D.oxidation

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An accidental path of low resistance, allowing passage of abnormal amount of current is known as a/an_____.
A.open circuit
B.short circuit
C.polarized ground
D.ground reference point

A.
A.open
B.short
C.polarized
D.ground