选出不同类的一项()。
A.不如因善遇之
B.项王即日因留沛公与饮
C.请以剑舞,因击沛公于坐
D.沛公起如厕,因招樊哙出
答案:B
B.于是 其余的都是“介词,趁机”
Some stories ________ by the writer in her thirties.[ ]
A. wrote
B. written
C. were written
D. was written
求下列物质的相对分子质量:
(1)氯气(Cl2)
(2)磷酸(H3PO4)
(3)碳酸氢铵(NH4HCO3)
(4)尿素[CO(NH2)2]