封发特快专递邮件时，如清单不止一页，总件数应登在首页上。（）
参考答案：错
The ice cream cone and the iced tea were all introduced at the 1904 Louisiana Purchase Exposition, accidentally given the name of the St. Louise Fair.
A．known about
B．known for
C．known to
D．known as
封密形对称型材以其（）为理论线。
A.里面
B.厚度中心
C.图纸要求
