3亿4千5百万用科学记数法表示是______.

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问题:

3亿4千5百万用科学记数法表示是______.

考点:科学记数法和有效数字
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下列物质的化学式中,书写正确的是:(  )

A.氧气:O2

B.氯化铁:FeCl2

C.氧化钙:CaO2

D.氯化镁:MgCl

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颈牵引治疗常用于治疗神经根型颈椎病,其治疗中最多采用的体位是()

A.垂直位

B.后仰位

C.前屈20°~30°位

D.前屈40°~50°位

E.随意变动位

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Dick was born in a poor family. His father had a small boat and went fishing in the morning and sold the fish in the market in the afternoon. Then he bought some food for his family. When winter came, they were often hungry. One morning the hungry man fell into the river and wasn’t found. Dick’s mother left her three-year-old son without saying good-bye. His aunt had to look after him.
Twenty years passed. Dick became a tall, p man. He found work on a farm. He worked hard and wanted to get more money. He often went to see his aunt with some nice presents. The woman was very happy but one day she died in a traffic accident. The young man was very sad. After he buried her, he decided to buy a beautiful tombstone(墓碑)for her. He went to town and came in a shop, but all the tombstones were too expensive. He asked, "Do you sell an old tombstone, sir" "Yes, we do, sir," answered the shopkeeper. "Is it as expensive as the new one"
"No, it’s much cheaper," said the man. "But another name was engraved (刻) on it." "It doesn’t matter," said Dick. "My aunt couldn’t read.\

If ______, the family members were hungry.

A.Dick’s father could catch no fish in winter

B.Dick’s father had a boat in winter

C.Dick’s father had to look after him in winter

D.no food was sold in winter

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被查询行收到查询书时,经会计主管审核授权后在()营业终了前必须进行查复,如有特殊情况不能及时查复的,查复时间最迟不超过()上午。

A.次日,下一工作日

B.次日,次日

C.当日,两日内

D.当日,下一工作日

题型:填空题

药物与特异性受体结合后,可能激动受体,也可能阻断受体,这取决于

A.药物的作用强度

B.药物是否具有亲和力

C.药物的剂量大小

D.药物的脂溶性

E.药物是否具有内在活性

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