施密特触发电路主要的用于波形变换、（）和脉冲鉴幅。
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Many exam candidates lose marks simply __________ they do not read the questions properly.
Bill works __________ foreman at Whiting’s Corporation.
________ the sun was shining, he went out wearing a coat.
________ I hear that tune, it makes me think of my former classmates.
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