不定项选择
光导纤维是利用光的全反射作用来传导光线的透明度极高的玻璃细丝。
A.错误
B.正确
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What can tone of voice do? A、Convey your moods. B、Convey your emotions. C、Convey your perspective. D、Convey your thoughts.
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未分类题
Analogic change refers to the reduction of the number of exceptional or irregular morphemes.
A.
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