题目内容
Zhang Lei: What shall we do to celebrate the Teachers’ Day?Marry: We can make a card ______buy a card for Miss Wang.
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Zhang Lei: What do you usually do on Mother’s Day?Marry: I usually buy some flowers. They are nice______ cheap.
Zhang Lei: Mark invited me to the Christmas party at his home. What gift shall I take?Marry: You can buy some gifts, _____you needn’t spend too much money.
组合逻辑电路在结构上__________。
下列对组合逻辑电路特点的叙述中，错误的是__________。
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