我国的标准时间是以()度为依据,作为北京时间的标准
Consonant sounds can be either ()or(),while all vowel sounds are ().
当进入了AUTOCAD环境中(即AUTOCAD的图形编辑器)时,缺省时所建立的坐标系统为()
A. 用户坐标系
B. 世界坐标系
C. 相对坐标系
D. 绝对坐标系
What can I do for you, madam?()
A. Thank you.
B. You can't help me.
C. I want to buy a camera.
D. I'm glad to hear that