在碾压水泥混凝土时，压路机头两遍的碾压速度以（）km/h为宜。
A. 5～0
B. 5～7
C. 0～5
D. 0～5
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通过房地产产权统计,可以为国民经济发展和城市规划提供科学的决策依据。()
A. 正确
B. 错误
钢筋和混凝土之间的粘结力是保证钢筋和混凝土共同工作的重要条件之一,下列因素中哪一个不是影响粘结力的因素？()
A. 混凝土强度
B. 钢筋保护层厚度
C. 钢筋的含碳量
D. 钢筋外形与净距
Which of the following statements about salt is Not True？
A. For many years people have been unaware of the many problems of salt including its corrosive effects.
B. Salt is the cheapest among its many alternatives with its purchase price of $ 25 a ton.
C. The national bill of salt may reach as high as $ 5 billion a year.
D. The economic cost of salt is still lower than the cost of CMA.
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