问题
单项选择题
心衰引起胸水的机制
A．毛细血管通透性增加
B．毛细血管内静水压增加
C．胸腔内负压增加(淋巴管破裂)
D．血浆胶体渗透压降低
E．胸内淋巴引流障碍
答案
参考答案：B
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心衰引起胸水的机制
A．毛细血管通透性增加
B．毛细血管内静水压增加
C．胸腔内负压增加(淋巴管破裂)
D．血浆胶体渗透压降低
E．胸内淋巴引流障碍
参考答案：B
| As viewed from space, the Earth’s distinguishing characteristics are its blue waters and white clouds. Enveloped by an ocean of air consisting of 78% nitrogen and 21% oxygen, the planet is the only one in our solar system known to harbor life. Circling the Sun at an average distance of 149 million km (93 million miles), the Earth is the third planet from the Sun and the fifth largest planet in the solar system. Its rapid and molten nickel-iron core give rise to an extensive magnetic field which, coupled with the atmosphere, shields us from nearly all of the harmful radiation coming from the Sun and other stars. Most meteors burn up in the Earth’s atmosphere before they can strike the surface. The planet’s active geological processes have left no evidence of the ancient pelting it almost certainly received soon after it was formed. The Earth has a single natural satellite-the Moon. |
Which of the following helps to create the Earth’s magnetic fields
A．Its blue waters.
B．Its nitrogen atmosphere.
C．Its molten metal core.
D．The Moon.