已知H2A的Ka1= 1×10[img=17x22]1803d1aec4be817.png[/img], Ka2= 1×10[img=17x22]1803d1aecd1eebc.png[/img], 现将0.1mol的NaHA配成1L溶液，其pH= _____________

background:url(2、png),url(1、jpg),url(3、png),url(4、jpg);},表示哪张图片处在最上层() A: 2、png B: 1、jpg C: 3、png D: 4、jpg

background: url(2、png),url(1、jpg),url(3、png),url(4、jpg);},表示哪张图片处在最上层（）。

In 1803 the United States purchased Louisiana from _____.

【判断题】对于维持阻塞结构的D触发器，当CP=1期间，输入信号D由1跳转到0，则由于=D，输出状态Q也由1跳转到0。 data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGMAAAAwCAYAAAAFIcTMAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAKNSURBVHhe7Zk/jw1RGMYHH0BEu4XQSiT A.对 B.错

In 1803, President Jefferson negotiated the purchase of Louisiana from Mexico.

气相色谱法测定食品中有机氯农药残留量常用的检测器是（） A: AECD B: BFID C: CTCD D: DFPD

In the landmark decision of Marbury v. Madison, 5 U.S. (1 Cranch) 137 (1803), Chief Justice John Marshall structured the Courts opinion, and in his judgment, John Marshall clarified and identified three core legal issues to be decided. What are three core legal issues in the case?

国际网球联合会成立于 A: 1903 B: 1803 C: 1913 D: 1923

霍尔效应哪一年发现的？ A: 1881 B: 1879 C: 1803 D: 1831