接收我国的数字电视节目,必须同时符合()标准的数字卫星接收机。
A、MPEG-2
B、DVB-2
C、MPEG-4
D、MPEG-3
E、MPEG-5
参考答案:A, B
调节远曲小管、集合管对水重吸收的主要因素是()
A.抗利尿激素
B.醛固酮
C.肾上腺素
D.血管紧张素Ⅱ
E.肾素
Directions: Write an essay of 160~200 words based on the following drawings. In your essay, you should:
1) describe the drawing briefly;
2) interpret the phenomenon reflected by it, and then
3) give your comments.
You should write neatly on ANSWER SHEET 2.