The oscillator was easier to use, more stable, and less expensive than others available at the time.

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问题 The oscillator was easier to use, more stable, and less expensive than others available at the time.

选项 A、changeable
B、unchanging
C、diverse
D、strong

答案B

解析 stable“稳定的”;changeable“可改变的”;unchanging“不变的”;diverse“不同的、变化多的”;strong“强壮的”。
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