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
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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
Higher concentrations ofcopper(Cu)in amalgam will act to()
A. tie-up tin
B. reduce gamma-2 formation
C. reduce creep
D. reduce corrosion