一般48V程控交换机电压范围为42～56.0V之间，邮电部允许的电池至交换机回路压降为1.5V。
参考答案：对
读一读，补全对话。
Chen: Hey! 1___________________?
John: We are doing an expriment.
Chen: 2___________________?
John: What do ants like to eat?
Chen: That's interesting.
John: Come and have a look.
Chen: 3___________________?
John: 4___________________. They don't like vegetables.
Chen: Are they eating the candies?
John: 5___________________. They like sweet food.
白肋烟C5的颜色、光泽分别为（）
A、浅黄较暗
B、浅红黄、浅黄较暗
C、浅红黄稍暗
D、近红黄、浅红黄尚鲜明
