ATA-100规范由几位数字组成:()
A.2
B.4
C.6
D.8
参考答案:C
The ________ for tonight’s talk is protecting the environmet.
A.title
B.subject
C.news
D.theme
一般观测场面积正确的是().
A.25m*25m,因条件限制也可取16(东西)*20m(南北)
B.25m*25*,因条件限制也可取20m(东西)*16(南北)