列表框的默认选择属性符合规范的正确写法为()(选择一项) A: selected="selected" B: selected C: checked="checked" D: selected="true"

From a population of 500 elements, a sample of 225 elements is selected. It is known that the variance of the population is 900. The standard error of the mean is approximately

How are the ”MPs” generally selected?

下面哪些语句写法是正确的？ A: $("select B: sel1>option:selected").appendTo($("select C: sel2")); D: $("select E: sel1>option:selected").appendTo("select F: sel2"); G: $("select H: sel2").append("select I: sel1>option:selected"); J: $("select K: sel2").append($("select L: sel1>option:selected")); M: $("select N: sel2")[0].append("select O: sel1>option:selected");

The committee selected the plan that seemed most ______.

中英文互译：selected ion monitoring

KFC selected local partners at the beginning.

Our classroom is selected ________the place for meeting.

下面HTML代码中表示复选框处于选中状态的是( )。 A: input type="checkbox" selected="selected" B: C: D:

In 2009, Dragon Boat Festival was selected into world non-material cultural heritage list, and became the second festival selected into world non-material cultural heritage list in China.