高速铁路板式无碴轨道,填充于轨道板与混凝土基础或梁之间的一种弹性、缓冲材料称为CA砂浆,即水泥(cement)沥青(asphaltum)砂浆。
参考答案:对
The children grew up in beautiful________ but not in a happy home________ .[ ]
A. environment; surroundings
B. surroundings; environment
C. surrounding; environment
D. environment; surrounding
急性肾盂肾炎的治疗疗程是()
A.3天
B.1周
C.5天
D.2周
E.2周或更长