题目内容

关于静脉瓣的描述哪些正确

A. 为两个半月形薄片
B. 根部与内膜相连
C. 游离缘朝向血流方向
D. 由静脉内膜向管腔折叠而成
E. 可防止血液倒流

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下列哪些成分参与微循环的构成

A. 微动脉和微静脉
B. 真毛细血管网
C. 直接通路
D. 动静脉吻合
E. 毛细血管前微动脉和中间微动脉

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The battle of Saratoga was very important in American War of Independence, because ___________.

A. it saw the surrender of the British General Cornwallis
B. it is a very important turning-point towards the good of the Americans
C. it was won under the ledership of a French General
D. none of the above

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America's Declaration of Independence was worked out in ____.

A. Chicago
B. Philadelphia
C. Washington
D. New York

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Influenced by ____’s travel book, kings, lords and merchants in Western Europe were eager to get hold of the treasures from the east.

A. Gulliver
B. Marco Polo
Columbus
D. Magellan

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关于静脉瓣的描述哪些正确

A. 为两个半月形薄片 B. 根部与内膜相连 C. 游离缘朝向血流方向 D. 由静脉内膜向管腔折叠而成 E. 可防止血液倒流

下列哪些成分参与微循环的构成

The battle of Saratoga was very important in American War of Independence, because ___________.

America's Declaration of Independence was worked out in ____.

Influenced by ____’s travel book, kings, lords and merchants in Western Europe were eager to get hold of the treasures from the east.

A. 为两个半月形薄片
B. 根部与内膜相连
C. 游离缘朝向血流方向
D. 由静脉内膜向管腔折叠而成
E. 可防止血液倒流