工程材料在生产加工过程中表现的工艺性能包括( )。
A．力学性能
B．焊接性能
C．热处理性能
D．物理性能
参考答案：A,B,C
My sister asked me to go there by train, because the train ticket is ______ the plane ticket. [ ]
A. as cheap three times as
B. as three times cheap as
C. three times cheaper than
D. cheaper three times than
根据自然地理环境的影响，古代文明可分为大河文明和海洋文明。以下古代文明中，受自然地理环境影响明显不同的是[ ]
A．古埃及
B．古巴比伦
C．古印度
D．古希腊
