A．On the grass.B．Near the pool.C．On his bike.D．At home.
A. On the grass.
B. Near the pool.
C. On his bike.
D. At home.
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房屋建筑在正常设计、正常施工、正常使用和维护下所应达到的使用年限为()。
A. 耐久极限
B. 设计使用年限
C. 使用年限
D. 使用寿命
学生与课程之间存在如下图所示的m：n联系按照规则，将其转化为关系模式的数目应是
A. 1
B. 2
C. 3
D. 4
现场浇筑混凝土自由倾落高度不宜超过()m。
A. 2
B. 3
C. 4
D. 5
A．I didn't know why.B．I will do my best.C．My car broke down on the highway.D．I had a wo
A. I didn't know why.
B. I will do my best.
C. My car broke down on the highway.
D. I had a wonderful time.
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