The most effective sealant for preventing moisture contamination ofa GIC is a()
A. copal varnish
B. vamish provided by the GIC manufacturer
C. thin layer of Dycal
D. low-viscosity，light-activated bonding resin
Which of the following components could replace eugenol in a zinc oxide paste()
A. oil ofcloves
B. acetic acid
C. alginic acid
D. ortho-ethoxybenzoic acid
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