问题
单项选择题
混凝土配合比设计的三个关键参数是( )。
A．水灰比、砂率、石子用量
B．水泥用量、砂率、单位用水量
C．水灰比、砂率、单位用水量
D．水灰比、砂子用量、单位用水量
答案
参考答案：C
解析：配合比设计的目的就是为了确定混凝土拌和物中水、水泥和粗细骨料的用量
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混凝土配合比设计的三个关键参数是( )。
A．水灰比、砂率、石子用量
B．水泥用量、砂率、单位用水量
C．水灰比、砂率、单位用水量
D．水灰比、砂子用量、单位用水量
参考答案：C
解析：配合比设计的目的就是为了确定混凝土拌和物中水、水泥和粗细骨料的用量
| 从方框内选择适当的单词并用其正确形式完成句子（每词只能选用一次）。 | |
2. He couldn’t forget his _________ time to feed pigs. 3. He has always dreamed about _______ a basketball player like Yao Ming. 4. —Oh, you are looking so tired. What happened? —I ran a long way without _______. 5. Be sure to watch your  bags _______. 6. Give me a call as soon as you _______ there. 7. Difficulties can make us feel _______ and be more hopeful about the future. 8. Sweat (汗) wet through his clothes  and _______ from his forehead. 9. There is something wrong with the old woman’s eyes, so she did everything very________. 10. Several _______ of eyes looked at the young man and his face  turned red. |
drop, careful