皮皮学,免费搜题
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搜题
【单选题】
过敏性炎症时循环血中增多的白细胞种类是
A.
中性粒细胞
B.
嗜酸性粒细胞
C.
浆细胞
D.
单核细胞
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【判断题】断路器的操作把手在'预备合闸'位置时绿灯闪光,'预备跳闸'位置时红灯闪光。( )
A.
正确
B.
错误
【判断题】断路器操作把手预备合闸位置时,绿灯闪光;在预备跳闸时,红灯闪光。
A.
正确
B.
错误
【单选题】Why did the author stop giving speeches for a while?
A.
The death of his stepbrother makes him feel guilty.
B.
The development of seat belt avoided most accidents.
C.
There are no more requests from schools inviting him.
D.
He did not have enough time to give lectures at that time.
【判断题】DNA的分子中碱基间是互补配对的。
A.
正确
B.
错误
【单选题】Why did the author's aunt try to teachher children to speak Korean?
A.
To help her improve herKorean language skills.
B.
To help them establish aKorean identity.
C.
To help them succeed inthe U.S.
D.
To help them find a goodjob.
【单选题】Why did the author visit Australia?
A.
to study Australian farming methods
B.
to investigate how the fence was constructed
C.
because he was interested in life around the fence
D.
because he wanted to learn more about the wool industry
【判断题】药品监督管理部门对药品可能存在的安全隐患开展调查时,药品生产企业应当予以协助。
A.
正确
B.
错误
【单选题】下列各项中,( )是DNA复制过程的正确顺序? (1)互补碱基对之间氢键断裂 (2)补碱基对之间形成氢键 (3)DNA分子在解旋酶的作用下解旋 (4)以解旋后的母链为模板进行碱基互补配对 (5)自恋与母链盘旋成双螺旋结构
A.
(1)(3)(4)(2)(5)
B.
(1)(4)(2)(5)(3)
C.
(1)(3)(5)(4)(2)
D.
(3)(1)(4)(2)(5)
【简答题】根据DNA分子结构模式图回答下列问题:【图片】(1)写出名称:① ② ③ ④_____________;⑤_____________;⑥_____________;(2)分析这种结构的主要特点:①DNA分子的基本骨架由_____________交替连接而成。②DNA分子两条链上的碱基通过_____________连接成碱基对。碱基之间的一一对应关系叫③D...
【判断题】断路器的操作把手在"预备合闸"位置时绿灯闪光,"预备跳闸"位置时红灯闪光。
A.
正确
B.
错误
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