在超文本中插入视频剪辑文件sample_1.rm，鼠标移到视频播放区域上时，才开始播放该RM文件。实现这一功能正确的HTML程序为 (45) 。
A: ＜IMG dynsrc="sample_1.gif" start=mouseover＞
B: ＜IMG dynsrc="sample_1.gif" start=fileopen＞
C: ＜IMG dynsrc="sample_1.rm" start=mouseover＞
D: ＜IMG dynsrc="sample_1.rm" start=fileopen＞
A: ＜IMG dynsrc="sample_1.gif" start=mouseover＞
B: ＜IMG dynsrc="sample_1.gif" start=fileopen＞
C: ＜IMG dynsrc="sample_1.rm" start=mouseover＞
D: ＜IMG dynsrc="sample_1.rm" start=fileopen＞
举一反三
- 随机生成10个1-100之间的随机数,用语句（ ） A: sample(1:10,100) B: sample(1:100,10) C: sample(10,1:100) D: sample(1~100,10)
- If [img=114x23]1803dc1abbcac9d.png[/img] is a sample of normal population N([img=36x26]1803dc1ac53b272.png[/img]), and [img=15x22]1803dc1acde7709.png[/img] and [img=19x22]1803dc1ad5f413c.png[/img] are the sample mean and sample variance, then [img=15x22]1803dc1acde7709.png[/img] and S are independent of each other.
- 有如下类声明:[img=151x93]17da6613415c347.png[/img]则下列构造函数的定义形式中错误的是( ) A: Sample::Sample(int k1, int m1):k(k1) {m=m1;} B: Sample::Sample(int k1, int m1): m(m1),k(k1) { } C: Sample::Sample(int k1, int m1):m(m1) {k=k1;} D: Sample::Sample(int k1, int m1):k(k1),m(m1) {}
- What is the good news mentioned in Sample 1?
- 函数\(y = \sqrt {1{\rm{ - }}x} \)的导数为（ ）. A: \({\rm{ - }}{1 \over {2\sqrt {1{\rm{ - }}x} }}\) B: \({1 \over {2\sqrt {1{\rm{ - }}x} }}\) C: \({1 \over {\sqrt {1{\rm{ - }}x} }}\) D: \( - {1 \over {\sqrt {1{\rm{ - }}x} }}\)