Đề KS thi THPT Quốc gia năm 2017-2018 môn Toán lớp 11 của trường THPT Triệu Sơn 3 – Mã đề 93 phục vụ cho các bạn học sinh tham khảo nhằm củng cố kiến thức môn tiếng Anh trung học phổ thông, luyện thi tốt nghiệp trung học phổ thông và giúp các thầy cô giáo trau dồi kinh nghiệm ôn tập cho kỳ thi này. Hy vọng đề thi phục vụ hữu ích cho các bạn. | Under certain circumstances, the human body must cope with gases at greater-than-normal atmospheric pressure. For example, gas pressures increase rapidly during a dive made with scuba gear because the breathing equipment allows divers to stay underwater longer and dive deeper. The pressure exerted on the human body increases by 1 atmosphere for every 10 meters of depth in seawater, so that at 30 meters in seawater a diver is exposed to a pressure of about 4 atmospheres. The pressure of the gases being breathed must equal the external pressure applied to the body; otherwise breathing is very difficult. Therefore all of the gases in the air breathed by a scuba diver at 40 meter are present at five times their usual pressure. Nitrogen, which composes 80 percent of the air we breathe, usually causes a balmy feeling of well-being at this pressure. At a depth of 5 atmospheres, nitrogen causes symptoms resembling alcohol intoxication, known as nitrogen narcosis. Nitrogen narcosis apparently results from a direct effect on the brain of the large amounts of nitrogen dissolved in the blood. Deep dives are less dangerous if helium is substituted for nitrogen, because under these pressures helium does not
