根据句意和所给首字母补全单词

1.His father is an e_____,and he designs ( 设计) a lot of bridges.

2.The Chinese g_____didn't want a foreigner for a Chinese railroad.

3.It was difficult to build the railroad because there were a lot of bridges and t_____.

4.Mr. Smith is the h_____of Mrs. Smith.

5.Yang Liwei is a great a_____in China.

下列不属于混凝土掺入减水剂的技术经济效果的是( )。

A．保持用水量不变，掺减水剂可增大混凝土坍落度10～20cm，能满足泵送混凝土的施工要求

B．保持强度不变，掺减水剂可节约水泥用量5%～20%

C．保持水泥用量不变，掺减水剂可节约用水量5%～20%

D．掺入减水剂为水泥质量的1%左右，在保持坍落度不变时，减水率为14%～18%