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某孕妇现孕30周,长时间仰卧后,出现血压降低、心率加快、面色苍白等症状。出现这种情况的主要原因是( )
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Fill in the blanks with the words given below. Change the form where necessary. Each word can be used only once.maintain prestige whereby nominate inhibitpatriotic pursuit dedicationendeavor transcend1. Most cities in the country have introduced "Clean Air Zones"______factories and households are only allowed to burn smokeless fuel.2. He knows that the______of social status can consume vast amounts of his time and effort.3. The doctors are at a loss because so far no medicine has been found to______the spread of the disease.4. We see many special education directors trying to______the quality of their programs with much less money and much smaller staff.5. People there are told it is their______duty to support the national economy by buying their own products.6. Darwin's thinking both drew upon and______the conventional ideas of his time.7. In spite of all your______, there may be times when you encounter difficulties in the training process.8. My advice to Mr. Stewart is to think carefully before entering into a career in medicine, as this is a field which requires a lot of______and long working hours.9. Most Chinese parents would prefer to choose some professions that are stable and could bring______and economic benefits.10. It is legally possible for an elderly person to______someone to act for them, should they become incapable of looking after themselves.
抚育间伐后林木的活枝下高（ ）。
防风林间伐强度和选木决定于（ ）。
抚育采伐的开始期在IV、V级木达到( )。
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