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单项选择题

行保留灌肠最佳的时间是 A.
早晨起床后 B.
上午治疗时 C.
午睡后生活护理时 D.
下午家属探望有人协助时 E.
夜间睡觉前

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单项选择题
After working long hours on her feet everyday in the operating room, Taryn Rose knew a lot about foot pain. But unlike most of her colleagues（同事）, she turned her pain into money. Today she is the boss of Taryn Rose International, a $528 million company that makes nice and comfortable shoes.
At the beginning, Rose realized the only thing that could stop her was fear of failure. “I could hear my friends and family saying, ‘Why did you leave a good job?’ If I failed, would I be okay facing them? And I thought, ‘So what? I can go back for further study in medicine.’ I started to accept that it would be okay to say, ‘I failed, but I tried.’ Once I was comfortable with that thought, the fear came to an end. I realized I feared regret more than failure. And after you turn to the path you choose, there is nothing acceptable but Success. ”
Now, Rose has no regrets about leaving medicine. “What I’m doing is not all that different from what I was doing as a doctor. The goal is the same to relieve pain. A former professor told me, ‘You’re helping hundreds of thousands of women with your shoes. As a doctor, you would have helped only the few who went to your office. You’re having a much greater effect.’”
Looking back, Rose admits she caught a couple of lucky breaks. “To me, luck is about being prepared for those opportunities（机会）that come knocking. You have to have an open mind, the right skills and all your senses working to see what opportunities present themselves. Luck can open the door, but you still have to walk through it.”
Which of the following can best explain the last sentence in the passage? （　　
A.Youhavetodowhatyoucanafterluckbringsyouopportunities
B.Youshouldopenthedoorwhenopportunitiescometoyou
C.Youhavetobepreparedforwalkingthroughthedoor
D.Youshouldopenyoureyestoseeopportunitiesclearly
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用轻骨料混凝土小型空心砌块或蒸压加气混凝土砌块砌筑墙体时，墙底部应砌烧结普通砖或多孔砖、普通混凝土小型空心砌块、现浇混凝土坎台等，其高度不宜小于：( )
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B.150mm
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高层建筑内的消防水池，其总容积超过( )m3时，应分成两个能独立使用的消防水池。
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C.1500
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