问题
单项选择题
我国标准规定加速器旋转运动标尺的零刻度位置的检定周期（）
A.每日
B.每周
C.每月
D.每半年
E.每年
答案
参考答案：E
解析：我国标准规定加速器旋转运动标尺的零刻度位置的检定周期为每年。
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我国标准规定加速器旋转运动标尺的零刻度位置的检定周期（）
A.每日
B.每周
C.每月
D.每半年
E.每年
参考答案：E
解析：我国标准规定加速器旋转运动标尺的零刻度位置的检定周期为每年。
My friends and I had just finished lunch at a hotel when it started to pour heavily. When it became lighter, I decided to brave the rain(冒雨) to get my , which was parked at my office three streets away. My friends argued that I shouldn’t go, mainly I was seven months pregnant (怀孕的) then. I told them that I’d be very . One of them wanted to come with me but I insisted that she should stay with another friend who needed with her baby.  I walked out of the and started making my way to the car. At the traffic crossing，a car stopped and the passenger with an umbrella. I knew what was happening, he walked right beside me and told me he’d send me to my destination(目的地). I was very embarrassed(尴尬的) and refused, he insisted on offering me his help. During our walk, he kept telling me to walk slower, as the ground was . When we got to the car parking lot, I him and we parted(分手). I did not get his and may not even recognize(认识) him now. Did he purposely stop for me? I’ll never know. So how did I pay it forward? I was at home when I two Indian construction(建筑) workers walking in the heavy rain. They were probably on their way to the construction sitenear my home, which was a long walk. I went out and them an umbrella. The two men were wet through. They were surprised by my action , and I told them they should the umbrella and keep it. They were very . And like me, probably wondered why a stranger was giving such kindness.
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