In business documents, apologize only when you are at fault
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A clear and convincing reason prepares the audience for the refusal, resulting in audiences who find it easier to accept the negative message.
A. 对
B. 错
写出作用在流体上的力按作用方式的两种分类及其定义和单位
请翻译下列表示时间的单词、短语。①昨天②上周③上个月④昨晚⑤在1989年⑥两天前⑦六周以前⑧上周末⑨前天⑩去年暑假
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