铬酸盐膜主要由两部分组成即不溶性的三价铬化合物及()。
A.石蜡
B.单组分胶粘剂
C.可溶性的六价铬化合物
D.成膜树脂
参考答案:C
颞下关节功能紊乱综合症
In 1724, ______ published, under the pseudonym of Drapier, a series of letters that called on the whole country to refuse the newly-minted English copper coins which would further debase the coinage of the already poverty-stricken country.
A. Jonathan Swift B. Charles DickensC. Edmund Spenser D. George Bernard Shaw