珊瑚死后变为珊瑚石,是被碳酸钙物质代替的过程,这个过程叫钙化。在钙化过程中珊瑚吸附了

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问题:

珊瑚死后变为珊瑚石,是被碳酸钙物质代替的过程,这个过程叫钙化。在钙化过程中珊瑚吸附了海水中的各种元素,如果吸附的元素以()为主,则珊瑚石的颜色就是红色。

A、铁

B、铝

C、镁

D、铜

考点:地球科学海洋科学导论海洋科学导论题库
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社会工作者斐斐毕业于某大学社会工作专业,在工作过程中,她遵循相关准则,运用所学的知识真诚地为服务对象提供帮助,她的工作受到大家的一致好评。这说明,社会工作者具有()等基本特征。

A.掌握一定的社会工作专业方法

B.社会服务是其业余活动

C.在一定的组织框架内开展活动

D.认同并遵循社会工作的价值准则

E.从事社会福利服务

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男性,69岁,患急性广泛前壁心肌梗死,入院后出现夜间阵发性呼吸困难,心率126次/分,心尖区闻及舒张早期奔马律,两肺底闻及湿性啰音,正确的诊断是急性心肌梗死伴有().

A.左心衰竭

B.右心衰竭

C.全心衰竭

D.支气管哮喘

E.急性心包填塞

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论述三相异步电动机的工作原理。

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(Ⅰ)

In the dining room of my grandfather’ s house stood his heavy clock. Meals in the dining room were a (21) for our four generations to become one. My grandfather’ s clock always stood like a trusted old family friend, (22) us playing jokes and tellingstories, which was already a (23) of our life.

When I was a child, the old clock interested me. I watched and listened to it during (24) I was surprised how at (25) times of the day, the clock would strike three times, six times or more, with a wonderful great (26) that echoed throughout the house. The clock chimed year after year, a part of my (27) , a part of my heart.

Even more (28) to me was my grandfather’s special action each day. He meticulously (29) the clock with a special key each day. The key was magic to me. It (30) our family’ s magnificent clock ticking and striking all year round.

29()

A. opened

B. wound

C. turned

D. started

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“同光体”在清同治、光绪、宣统年间影响巨大,这一诗派的代表作家有()

A、陈三立

B、沈曾植

C、范当世

D、曾国藩

E、陈衍

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