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问题 单项选择题 A1/A2型题

NST有反应型的表现是（）

A.20分钟内有3次以上胎动伴胎心率加速>15次/分、持续时间>15秒

B.胎心率基线变异在6次以上

C.早期减速在10分钟内连续出现3次以上

D.10分钟有3次中等宫缩情况下，无晚期减速

E.无宫缩时10分钟内出现3次胎动加速

答案

参考答案：A

单项选择题

"阳在外阴之使也，阴在内阳之守也"说明了下列何种关系

A．阴阳对立

B．阴阳互根

C．阴阳消长

D．阴阳转化

E．阴阳平衡
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单项选择题

The blue of the sea is caused by the scattering of sunlight by tiny particles suspended in the water. Blue light, being of short wavelength, is scattered more efficiently than light of longer wavelengths. Although waters of the open ocean are commonly some shade of blue, green water is commonly seen near coasts, especially in tropical or subtropical regions. This is caused by yellow pigments being mixed with blue water. Phytoplankton are one source of the yellow pigment. Other microscopic plants may color the water brown or brownish-red. Near the shore, silt or sediment in suspension can give water a brownish hue. Outflow of large rivers can often be observed many miles offshore by the coloration of suspended soil particles.Marine phytoplankton (Greek for "plant wanderers") are microscopic single-celled plants that include diatoms, dinoflagellates, coccolithophorids, green algae, and blue-green algae, among others. The growth of these organisms, which photosynthesize light, depends on a delicate balance of nutrient enrichment via vertical mixing, which is often limited by the availability of nitrogen and light. Diatoms are one-celled plants with patterned glass coverings. Each glass, or silicon dioxide box, is ornamented with species-specific designs, pits, and perforations making them popular with microscopists and, more recently, electron scanning microscopists.

The growth of phytoplankton is often limited by the availability of________.

A．oxygen

B．hydrogen

C．nitrogen

D．carbon dioxide
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