- 电场强度的叠加
- 共358题
产程中胎心监护，下列哪项是错误的
A．每次听胎心应听1分钟
B．潜伏期应每小时听胎心一次
C．听诊胎心应在宫缩间歇期宫缩刚结束时进行
D．第二产程应每15分钟听胎心一次
E．活跃期应每30分钟听胎心一次
正确答案
D
解析
暂无解析
枕前位分娩机制正确的是：
A．胎头进入骨盆入口时呈俯屈状态
B．下降动作呈持续性，贯穿于分娩全过程
C．胎头进入骨盆入口时呈半俯屈状态
D．俯屈动作完成后，胎头以枕额径通过产道
E．胎头颅骨最低点达骨盆最大平面时出现内旋转
正确答案
C
解析
暂无解析
According to Pro. Salt, plants that take up large amounts of metal in their tissues can be used to ______.
A．clean polluted soil and cure disease like cancer
B．clean up harmful waste materials in soil and improve people's diet
C．produce large number of micronutrients such as iron and zinc
D．create food with important minerals or vitamins
正确答案
B
解析
[分析] 文章首段即讲到美国的一位科学家，即下文中的David Salt，认为这样的植物可以用来解决两方面的问题――净化土壤和促进人类健康。
Mr. Salt wants to create anti-cancer foods by ______.
A．copying tissues from wild plants that take up selenium naturally into crop plants
B．copying genes that causes the plants to take up selenium from the soil
C．moving selenium from the tissues of wild plants into crop plants
D．moving genes from wild plants that take up selenium naturally into crop plants
正确答案
D
解析
[分析] 见文章的第六段。“Mr.Salt says foods to fight cancer might be created if genes from these plants could be moved into crop plants”，意为“Salt先生说如果能通过将这些植物的基因移进作物类植物中去，也许就能创造出抗癌食品。”A、B、C皆为表述接近的迷惑性选项，解题时要小心。
To add selenium by taking pills are probably not effective because ______.
A．the human body is not in the right chemical form
B．the human body does not accept it
C．the selenium is, not in the right chemical form to be absorbed
D．the selenium is difficult to absorb
正确答案
C
解析
[分析] 见文章的第八段。
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