题目:
His pale face suggested he ________ angry and I suggested that he ________ at once.
A.should be; should leave
B.was; left
C.was; leave
D.be; left
答案:
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答案:A题目分析:要使Ba2+完全沉淀,需要m molH2SO4,Ba2+:SO42-=1:1,既有m mol的BaCl2,就有2m mol Cl-,要使Cl-完全沉淀,需要n mol AgNO3,Ag:Cl=1:1,总共有 n mol的Cl-,减去BaCl2中含有的...