问题
单项选择题 A1型题
小儿时期白细胞分类有一重要特点，即中性粒细胞和淋巴细胞比例的"两次交叉"，时间分别是（）
A.4～6周和4～6个月
B.4～6天和4～6个月
C.4～6天和4～6岁
D.4～6周和4～6岁
E.4～6个月和4～6岁
答案
参考答案：C
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小儿时期白细胞分类有一重要特点，即中性粒细胞和淋巴细胞比例的"两次交叉"，时间分别是（）
A.4～6周和4～6个月
B.4～6天和4～6个月
C.4～6天和4～6岁
D.4～6周和4～6岁
E.4～6个月和4～6岁
参考答案：C
It all started at the beginning of the ninth grade. Carmen found she couldn’t see things all the time. She became very worried, but she hoped would know that. When her mother asked her to see the eye doctor, she didn’t . But her mother’s mind was made up. Three days later, Carmen got new glasses and instructions from her doctor. “All of the kids will think I’m .” Carmen said. Her mother and shook her head. “You look just as beautiful as before”, she said. But Carmen didn’t believe her. The next day, Carmen kept the in her pocket as she walked into the schoolyard. She stood alone away from her friends, feeling . Suddenly, she heard her friend Theresa shout. Carmen ran over to the other girls. “What’s the ?” she asked. “My ring is gone!” Theresa cried. “My sister sent it to me from California. It’s very and I can’t lose it.” Carmen and her friends began to the ring in the grassy area of the playground. Carmen realized that she could do better she could see better. She took the glasses out and put them on. Everything looked so ! So clear! She looked down at the ground and a bright light caught her eyes. It was the . “Here it is,” she shouted. She handed it to Theresa. “Thanks, Carmen,” she said. “I thought we’d find it.” she paused (停顿). “Hey, I didn’t know you wore glasses. They look great!” Carmen had that she was wearing the new glasses. “Thanks,” she replied. “Maybe wearing glasses won’t be so bad after all.” Carmen thought.
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3C(g)+ D(g)在容积不变的密闭容器中进行,达到化学平衡状态的标志是( )