【单选题】下列关于获取页面元素说法正确正确的是 ()
A.
document.getElementById(‘a’)是通过id值为a获取页面中的一个元素
B.
document.getElementsByName(“na”)是通过name属性值为na获取页面中的一个元素
C.
document.getElementsByTagName(“div”)是通过标签名获取去所有div;
【单选题】The real power of the British government lies in ______.
B.
the cabinet headed by the Prime Minister
【单选题】The real power of words exists in their______.
D.
representative function
【单选题】The real power of words exists in their ______.
D.
representative function
【单选题】The real power of words consists in their ______.
D.
representative function
【单选题】In Britain the real power was in ______.
【单选题】The real power of words exists in their______.
D.
representative function
【单选题】______ is the real center of power in Parliament.
【单选题】在某一混合蛋白质溶液中,各种蛋白质的pI分别为4.5,4。8,5.4,6.6和7.3时,电泳时欲使其中四种蛋白质向正极泳动,缓冲液的pH值应该是