目前两半式厚壁轴瓦广泛采用钢瓦壳，（）瓦衬。
A．巴氏合金
B．铜铅合金
C．锡青铜
D．高锡铝合金
参考答案：A
The opening province which ______ thirteen counties and three coastal cities will quicken its paces of economic development.
A．consists of
B．makes up of
C．is included
D．is contained
提高挖掘机生产能力的途径有哪些？
