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肺结核不是通过病人咳嗽、打喷嚏、大声说话等产生的飞沫传播的。()

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艾滋病病人不可以和正常人一起吃饭、游戏。()

吸烟有一个安全剂量，一天吸烟不超过5支对身体不会有损害。()

A Letter of Apology 致歉信 Write a letter of apology of about 100 words based on the following situation: You have just come back from New York and found a book in your luggage that you forgot to return to Mark, your landlord there. Write him a letter to make an apology and suggest a solution. Do not sign your own name at the end of the letter. Use "Li Ming" instead. Do not write the address.

用锤击法沉桩时，一般采用重锤低击。 ()