吸附力与哪项因素最有关()
A.义齿基托组织面与粘膜接触的密合程度
B.唾液的质和量
C.是否用软衬材料
D.是否戴过旧义齿
E.基托的厚薄程度
参考答案:A
体积为30 cm3的铜球,质量是89g,是空心的还是实心的?若是空心的,空心部分的体积是多少?(铜的密度ρ铜=8.9×103 kg/m3)
The goods which are carried into and out of the territory by the same vessel or aircraft are defined as
A.transit goods B.transshipment goodsC.through goods D.import and export goods