题目内容

Which of the following call increase residual mercury levels in amalgam()

A. condensing immediately following trimration
B. poor condensation technique
C. using all amalgam with a low mercury-to-ahoy
D. AandB

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在气压传动中，压缩空气的工作压力较低，一般为()MPA。

A. 0.2~0.4
B. 0.4~0.6
C. 0.4~0.8
D. 0.6~1.0

银合金粉主要由___、_、、__四元素组成。

铸造低合金钢的合金元素总量为（)A.<5%B.5%~10%C.≥10%D.≥15%铸造低合金钢的合金元素总量为（)A.<5%B.5%~10%C.≥10%D.≥15%
铸造低合金钢的合金元素总量为()

A. <5%
B. 5%~10%
C. ≥10%
D. ≥15%

In amalgam，tin acts to()

A. decrease strength
B. increase expansion
C. shorten the setting time
D. decrease its weight