今年，某市出现了大范围的扬沙天气．发生扬沙时，空气中增加了大量的（ ）
A．一氧化碳
B．可吸入颗粒物
C．二氧化氮
D．二氧化硫
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某种混合气体由A、B两种可燃气体组成。各组分的浓度及爆炸下限见下表，则这种混合气体的爆炸下限为( )。
A．组分名
B．在混合气体中的浓度
C．爆炸下限
D．A
E．80%
F．4%
G．B
H．20%
I．2%
Optimism and pessimism are both powerful forces. Each of us must choose which we want to our future and our expectations. We can choose to laugh or cry, bless or . It’s our decision: From which perspective do we want to view life? Will we look up in or down in desperation? I believe in the upward look. I choose to the positive and skip right over the negative. An optimistic attitude is not a luxury; it’s a(n) . The way you look at life will determine how you feel, how you perform, and how well you will get along with other people. , negative thoughts, attitudes, and expectations themselves; they become a self-fulfilling prophecy (预言). Pessimism creates a dark place where no one wants to live. Years ago, I drove into a service station to get some gas. It was a beautiful day, and I was feeling great. As I walked into the station to pay for the gas, the attendant said to me, “How do you feel?” That seemed like a(n) question, but I felt fine and told him so. “You don’t look well,” he replied. This me completely by surprise. A little confidently, I told him that I had felt better. Without hesitation, he continued to tell me how bad I looked and that my skin appeared yellow. By the time I left the service station, I was feeling a little . About a block away, I over to the side of the road to look at my face in the mirror. How did I feel? Was I affected with jaundice(黄疸)? Was everything all right? By the time I got home, I was beginning to feel a little nauseous(恶心). Did I have a bad liver? Had I some rare disease? On another beautiful day, when I went into that gas station, feeling again, I figured out what had happened. The place had recently been painted a bright, distasteful , and the light reflecting the walls made everyone inside look as though they had hepatitis（肝炎）! I wondered how many other folks had the way I did. I had let one short conversation with a total change my attitude for an entire day. He told me I looked sick, and before long, I was actually feeling sick. That single observation had a great effect on the way I felt and acted. The only thing more powerful than negativism is a word of optimism and hope. When a whole culture adopts an upward look, incredible things can be accomplished.
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房间隔缺损患者，缺损1.8cm2。现17周妊娠。
患者产后抗凝药物治疗，不正确的是（）
A.如无异常情况，产后12～48小时开始抗凝治疗
B.华法林抗凝，不宜母乳喂养
C.产后出血者，可以加用维生素K1
D.监测凝血酶原时间，调整抗凝药物剂量
E.华法林恢复使用初期需要与肝素叠加使用
线性多进制数字调制系统的优点是（），缺点是（）。
国家鼓励开展中医药专家技术经验和技术专长继承工作，培养高层次的( )
A．中医临床人才和中药技术人才
B．中医药理论人才
C．中医药学科发展带头人
D．中医药科研人才
E．高级专业技术职务人才