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— How _______ (be) the students?— They were very friendly.

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He often _ (have) supper at home. Today he (have) supper at school.

— he _ (have) lunch at nine?— No, he didn’t.

检测发动机功率的方法可分为、两种。

稳态测功时，需要对发动机施加外部负荷，所以稳态测功也称为或。