题目内容

Sulfur contamination may retard the setting reaction ofwhich ofthe following impression materials()

Agar hydrocoUoid
B. Polyether
C. Alginate
D. Addition silicone

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冷轧厂1780机组酸洗线拉伸矫直机为()弯()矫式,其工作辊直径为80mm。

AMF的含义是:()。

A. 秒流量控制
B. 扩展秒流量控制
C. 自动速度控制
D. 前馈控制

Dental impression compound is known as a/an()

A. chemoplastic material
B. irreversible material
C. hvdroelastic material
D. thermoplastic material

氧气顶吹转炉炼钢的原材料主要有()、造渣剂、和铁合金。

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