耐蚀性是金属材料的（）。
A.力学性能
B.物理性能
C.化学性能
参考答案：C
35. My cellphone looked quite similar to Alice’s, but it cost ______ hers.
A．as much twice as
B．more than twice as much as
C．twice as more as
D．twice so much as
不锈钢正畸弓丝可以通过以下哪种方法使其变硬（）
A.回火
B.冷加工硬化
C.老化变硬
D.沉积变硬
E.以上均不可以
