钢管混凝土拱桥管内混凝土配比强度应()。
A、按照设计强度
B、比设计强度高5%—10%
C、比设计强度高10%—15%
D、比设计强度高15%—20%
参考答案:C
In relation to contract law, explain the concepts of:
(c) The importance in distinguishing between an offer and an invitation to treat. (2 marks)
室内塑料给水管可布置在()的上面。
A.生产设备
B.灶台
C.给水管廊