短通话
A. The malfucntion warning was unable to cancel.
B. They could not reset the electrical circuit.
C. The aircraft's configuration kept clean.
D. The aircraft's warning system failed to be initiated.
The drawing frame must be drawn on the drawing by( ), and the title block should be located in the( ) of the drawing.在图纸上必须用()画出图框,标题栏一般应位于图纸的()方位.
A. Thick solid line, right and lower粗实线、右下
B. Thin solid line, right and lower细实线、右下
C. Thin solid line, right and upper细实线、右上
D. Thick solid line, right and upper粗实线、右上
Draw the machine parts with a ratio of 5:1. If the actual length of the machine part is 5mm, the drawing should be () mm. 用5:1的比例画机件,如果机件的实际长度为5mm,在图纸上应该画()mm。
A. 1
B. 2
C. 5
D. 25
Which of the following scales indicates the magnification ratio. 下列比例当中表示放大比例的是()。
A. 1:1
B. 1:2
C. 5:1
D. None of all above.以上都不是