对于不同排档的D一V/关系曲线来说,D值均有一定的使用范围,档位愈低D值愈(),则速度也愈()。
参考答案:大、低
根据句意,用适当的介词或副词完成下列句子。
1. When the sun began to go down, he stopped and put _______ a tent (帐篷).
2. We tried to cheer her up _______ telling her funny stories.
3. Could you please come up _______ some ideas for making money?
4. We gave _______ some money to some poor children in Yushu.
5. He called _______ his parents asking for some money.
混凝土的碱骨料反应必须具备什么条件时才可能发生?()
(1)混凝土中的水泥和外加剂总含碱量偏高
(2)使用了活性骨料
(3)混凝土水条件下使用
(4)混凝土是在干燥条件下使用。
A.(1)(2)(4)
B.(1)(2)(3)
C.(1)(2)
D.(2)(3)