问题
单项选择题
热轧光圆钢筋的弯曲性能是指弯芯直径弯曲（）后，钢筋受弯曲部位表面不得产生裂纹。
A、90°
B、120°
C、135°
D、180°
答案
参考答案：D
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热轧光圆钢筋的弯曲性能是指弯芯直径弯曲（）后，钢筋受弯曲部位表面不得产生裂纹。
A、90°
B、120°
C、135°
D、180°
参考答案：D
Nick is a 14-year-old school boy. His life is full of exams and studies on weekday. He has 46 free time. He thinks playing computer games 47 the best way to make him relax. When he has free time, he sits in front of the computer. Just 48 that way, he doesn’t eat or drink for several hours. Last weekend, he played games on the computer again. He was too 49 and didn’t want to move. He didn’t have 50 for six hours. When he had to go to the bathroom, he found he could not move. He 51 to the hospital. The doctor told him he should have a good rest and 52 exercise. After coming back from the hospital. Nick follows the doctor’s 53 .He often plays soccer with his friends. 54 sometimes he still plays computer games on weekends, he 55 does it for long. Now he lives a happy and healthy life.
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