目的：研究两种洁治器洁治前后镍铬、钯和银钯全冠合金表面形貌的变化。

Objective: To study the damages made by metal-tip or carbon-tip ultrasonic scaling on the surfaces of Ni-Cr alloy, Pd-based alloy and Ag-Pd alloy.

youdao

目的：研究两种洁治器洁治前后镍铬、钯和银钯全冠合金表面形貌的变化。

Objective: To study the damages made by metal-tip or carbon-tip ultrasonic scaling on the surfaces of Ni-Cr alloy, Pd-based alloy and Ag-Pd alloy.

youdao