第二产程延长是指（）
A.总产程超过24小时
B.宫口开大3cm至宫口开全超过8小时者
C.总产程不超过3小时
D.宫口开全后初产妇超过2小时
E.从临产至宫口开大3cm，超过16小时者
参考答案：D
解析：潜伏期是指从临产出现规律宫缩至宫口扩张3cm，此期间扩张速度较慢，平均每2～3小时扩张1cm，约需8小时，最大时限为16小时，超过16小时称潜伏期延长，故第1题选E。第二产程初产妇需要1～2小时，不应超过2小时，经产妇在1小时内，故第2题选D。
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| Sea turtles are found in all warm waters throughout the world. Sea turtles are the___1____ of the turtles. The largest kind of sea turtle can grow as long as eight feet and ___2___ 1,500 pounds. Even the smallest kind, Kemp's-Ridley, can ___3___ to 28 inches long and weigh almost 100 pounds. Many other turtles are small enough to___4___ in your hand. It is difficult to find population numbers for sea turtles because they do not___5____ shore once they hatch and reach the ocean, which makes it hard to ___6___ them. Sea turtles___7___ in the water because they are safer there. They cannot___8___ their heads and feet into their shells like other turtles can. Sea turtles cannot hide inside their shells __9___ other animals that want to eat them. They need to move quickly to stay safe. When the weather ___10___ warm, sea turtles leave the ocean to___11___ their eggs on the beach. This is the only time they will ever leave the water. Most___12____ turtles spend part of the time in water___13___ part of the time on land. It is easy to understand___14____ sea turtles stay in the water. Their___15___ to swim is greater than their ability to walk. Their heavy bodies and unusual feet make it hard for them to ___16___ on land. They are better___17___ for life in the water. They are well suited for life in the sea because of__18___ their bodies are made. The way their feet are made helps sea turtles swim very quickly. Their feet look like long __19___. When they swim, they flap their feet like a bird flaps its wings. This ___20___ way of swimming benefits sea turtles. It allows them to escape from their enemies. | ||||
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