问题
单项选择题
空气中氧浓度降低到( )以下，致使机体组织的供氧不足，就会引起头晕、恶心、调节功能紊乱等症状。
A．14%
B．15%
C．16%
D．17%
答案
参考答案：B
解析： 在空间有限的工作场所，氧气被氮气、二氧化碳、甲烷、氢气、氦气等气体所代替，空气中氧浓度降低到17%以下，致使机体组织的供氧不足，就会引起头晕、恶心、调节功能紊乱等症状。
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空气中氧浓度降低到( )以下，致使机体组织的供氧不足，就会引起头晕、恶心、调节功能紊乱等症状。
A．14%
B．15%
C．16%
D．17%
参考答案：B
解析： 在空间有限的工作场所，氧气被氮气、二氧化碳、甲烷、氢气、氦气等气体所代替，空气中氧浓度降低到17%以下，致使机体组织的供氧不足，就会引起头晕、恶心、调节功能紊乱等症状。
Dear friends, Do you remember your first day at a new school or in a new area? How about the 31 when your family 32 to a new state? Ugh! What about the feelings of being a stranger? Then, with time, you find someone who likes 33 you like. Friends are great gifts in life. I have good friends too, but not because they are completely(完全的) 34 .Sometimes they talk too much; sometimes they need me a lot. I know I ask too much of them. I hope my friends, like my father, 35 about me a lot. I once told my friends to give me all their love and be generous and gentle. I told my friends, in other words, to love me 36 I loved them. They didn’t 37 me at first, but then they became kinder. My love for them slowly made them learn to 38 friends. They learned to love others and 39 the idea that LOVE is part of life. If we listen to and try to understand each other, love 40 .We should work on it, even if it’s hard at first. A true friend loves US at all times. Your friend, Jesus
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