下列不符合信函格式要求的是()。
A.发文机关不加“文件”二字
B.发文字号在武文线下版心右上角
C.首页应显示页码
D.发文机关名称只能标识全称
参考答案:D
The Summer Palace is really beautiful. In fact, I doubt whether China has _________ park.
A.a more beautiful
B. a most beautiful
C.the most beautiful
D. a beautiful
牙轮钻机的优点有哪些?