问题
单项选择题
管沟验收时，沟底宽度的误差为（）
A、±50mm
B、±100mm
C、±150mm
D、±200mm
答案
参考答案：B
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管沟验收时，沟底宽度的误差为（）
A、±50mm
B、±100mm
C、±150mm
D、±200mm
参考答案：B
| 完形填空。 | ||||
| When I was 14, I was hired for an after-school job selling subscriptions (征订) to my hometown paper, the Houston Post. I was sent to some of the city's worst neighborhoods to "beg" door-to-door. Even though I was often scrambling around after dark in bad areas 1 for garage apartments, I was 2 for the work. It was a 3 because people didn't like a stranger knocking on their door, 4 a kid trying to get them, to buy something. One time, a man shut his door heavily in my face and 5 , "I don't want your dawn paper!" I 6 myself to knock again and was able to tell him how 7 the paper was. I ended up selling him a subscription. I was soon among the 8 subscription sellers and, like other successful 9 , was given the chance to train newcomers. 10 this time I started playing the harmonica and guitar. Before long I was playing in a 11 at barbecues and other events. When I 12 18, I fixed my 13 on becoming a professional musician. I never lost 14 of this dream. I'm sure my determination came from what I 15 knocking on strangers' doors. That 16 helped me in many ways. Early in my music life I was 17 in a legal disagreement with a former manager. He 18 me to back off, but I refused. Having all those doors shut in my face as a kid gave me the 19 to stand up to this frightening figure. Except this time there was one 20 : I was the one saying no. And I won. | ||||
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缺失一年，
全冠烤瓷固定桥修复后2天，患者出现咀嚼时基牙疼痛，最常见的原因是（）