题目内容
______ regulations require that all personnel visiting the construction site wear protective helmet.
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Mr. Harris ______ from severe flu when he was supposed to meet with clients to discuss a contract renewal.
Our spokesperson, Richard Carter, has apologized for the ______ remarks about merger negotiations he made in the press conference.
There has been so much ______ in the demand for high-priced bags that several companies are introducing a greater range of price options.
根据CTT的模型和假设，可知SX2=ST2+SE2，关于这个公式描述正确的是
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