应在混凝土浇筑完毕后的（）h以内，对混凝土加以覆盖和保湿养护。
A、8
B、12
C、24
D、24
参考答案：D
耐候钢是指在大气中比（）具有良好耐蚀性的钢的总称。
What is the predicament that faces East Timor().
A. How to boost economy while building infrastructure.
B. How to develop tourism with a lack of infrastructure.
C. How to develop tourism without destroying its natural beauty.
D. How to develop tourism while boost economy.
