屏后设备标志符号包括的信息有：
A. 安装单位编号
B. 设备安装顺序号
C. 设备的文字符号及型号
D. 端子号及内部接线
1) How many people does the author say have tried stepping out of their comfort zone? ______
A. 98 percent.
B. The great majority.
C. A very small percentage.
D. About half.
Your journey through higher education will ______.
A. put you to the test constantly
B. damage your nerves
C. certainly help develop your ability
D. Solve your life's puzzles
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