问题
单项选择题
对φ20钢筋，梁顶和梁底之间净距分别要求（）。
A.梁顶≥30mm，梁底≥30mm
B.梁顶≥20mm，梁底≥25mm
C.梁顶≥30mm，梁底≥25mm
D.梁顶≥20mm，梁底≥30mm
答案
参考答案：C
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对φ20钢筋，梁顶和梁底之间净距分别要求（）。
A.梁顶≥30mm，梁底≥30mm
B.梁顶≥20mm，梁底≥25mm
C.梁顶≥30mm，梁底≥25mm
D.梁顶≥20mm，梁底≥30mm
参考答案：C
Stress(压力) is everywhere in our everyday life. Not only men have it, but also women and young people. The most important reasons of stress are: diseases, exams, making money, getting married, moving houses, changing jobs, ending friendships and so on. How do you know whether you have stress? Give your answers to the following questions?全
Doing relaxing exercises, talking with friends and listening to light music are all usual ways of relieving(减轻) stress. However, doctors now say that there are easier ways --- people should laugh and smile more often. When you laugh and smile, your body relaxes. They also say that people, especially men, should cry more often, because crying is the natural way of relieving stress. 小题1:If you have over ________ problems listed in the table, you are the person with stress.
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