A.the entire range of wavelengths of electromagnetic radiation
B.used to classify something in terms of its position on a scale between two extreme or opposite points
第1题
A.the exhaust valves
B.the fuel valves
C.indicator cocks
D.the fuel pumps
第2题
A.recommended
B.reproached
C.recompensed
D.reversed
第3题
A.recommended
B.reproached
C.recompensed
D.reversed
第4题
A.recommended
B.reproached
C.recompensed
D.reversed
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