问答题

大体积混凝土为什么容易产生裂缝？会有什么影响

【参考答案】

大体积混凝土会产生大量水化热，水汽蒸发过程中留下贯穿裂缝，会降低混凝土强度和抗渗性。
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Directions: Read the following passage. After reading it, you should give brief answers to the 5 questions that follow. The answers (in no more than 3 words) should be written after the corresponding numbers on the Answer Sheet. Passage 1 To effectively use this washing machine, you must complete four steps carefully, loading(装载) the clothes, pouring in the detergent (洗涤剂), adjusting the water temperature, and putting in the coins. First, throw clothes of similar color into the machine; for example, whites, colored clothes, and towels should be washed separately. While completing this step, you must be careful not to overload the machine. Second, you should read the directions on your detergent box to find out the correct amount for your particular load. Next, select one of three possible water temperatures, hot, warm, or cold. Generally, hot temperature is used for white clothes, warm temperature for light colored clothes, and cold temperature for dark or brightly colored clothes. Finally, after dosing the door of the washing machine, put in the proper amount of money. In summary, by following these simple directions, the washer will give you a clean load of wet clothes. 15. When should you put in the money? After ______ of the washing machine.
单项选择题
11.2.1.1
A．（1）
B．（2）
C．（3）
D．（4）
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