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分光光度法适用于测定（）、（）的浊度，最低检测浊度为（）度。
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合生心皮雌蕊，子房2至多室，其胎座类型为()。
The easy way out isn’t always easiest. I learned that lesson when I decided to treat Doug, my husband of one month, to a special meal. I glanced through my cook book and chose a menu which included homemade bread. Knowing the bread would take time. I started on it as soon as Doug left for work. As I was not experienced in cooking, I thought if a dozen was good, two dozen would be better, so I doubled everything. As Doug loved oranges, I also opened a can of orange and poured it all into the bowl. Soon there was a sticky dough covered with ugly yellowish marks. Realizing I had been defeated, I put the dough in the rubbish bin outside so I wouldn’t have to face Doug laughing at my work. I went on preparing the rest of the meal, and, when Doug got home, we sat down to Cornish chicken with rice. He tried to enjoy the meal but seemed disturbed. Twice he got up and went outside, saying he thought he heard a noise. The third time he left, I went to the windows to see what he was doing. Looking out, I saw Doug standing about three feet from the rubbish bin, holding the lid up with a stick and looking into the container. When I came out of the house, he dropped the stick and explained that there was something alive in out rubbish bin. Picking up the stick again, he held the lid up enough for me to see. I felt cold. But I stepped closer and looked harder. Without doubt it was my work. The hot sun had caused the dough to double in size and the fermenting yeast made the surface shake and sigh as though it were breathing. I had to admit what the living thing was and why it was there. I don't know who was more embarrassed by the whole thing—Doug or me. The writer’s purpose in writing this story is（） Why did the woman’s attempt at making the bread turn out to be unsuccessful?（） Why did the woman put the dough in the rubbish bin?（） What made the dough in the bin looks frighting?（） When Doug went out the third time, the woman looked out of the window because she was（）
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采购件镀镍螺丝库存不足，需要向三星公司采购，三星公司为了考虑运输及制造成本因素，限定买家每次必须至少购买100颗镀镍螺丝，低于则不卖，而且该镀镍螺丝是成包成包来卖的，50颗为1包，假设现在需购买镀镍螺丝170颗，则需向三星购买多少颗镀镍螺丝？（）
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