That is my CD, and()are yours. A.this B.th 发布时间:2018-04-19 01:19 │ 来源:www.tikuol.com 题型:单项选择题 问题: That is my CD, and()are yours.A.thisB.thatC.those
题型:单项选择题 Bank was the first crops from one continent to another________, helping to develop local economies with these new imports.A.move; on a large scaleB.moving; on large scale C.to move; on a large scaleD.moved; on a large scale 查看答案
题型:单项选择题 某二元酸(H2A)按下式发生电离:H2A=H++HA-;HA-H++A2-。现有下列四种溶液:①0.01 mol/L的H2A溶液 ②0.01 mol/L的NaHA溶液 ③0. 02 mol/L的HCl溶液与0.04 mol/L的NaHA溶液等体积混合 ④0. 02 mol/L的NaOH溶液与0.02 mol/L的NaHA溶液等体积混合下列关于上述四种溶液的说法正确的是 [ ]A.溶液②中存在水解平衡:HA- +H2OH2A+OH-B.溶液③中有:c(HA-)+c(A2-)=c(Na+) C.溶液④中有:c(OH-)=c(H+)+c(HA-) +2c(H2A) D.四种溶液中c(HA-)大小:③>②>①>④ 查看答案
题型:单项选择题 用某节流装置测量湿气体中干气部分的体积流量(标准状况下),如果工作状态下的相对湿度比设计值增加了,这时仪表的指示值将()。A.大于真实值B.等于真实值C.小于真实值D.无法确定 查看答案