通信机械室机架首、末位置距墙偏差应小于（）mm。
A.2
B.30
C.5
D.10
参考答案：B
为了延长白炽灯的寿命，灯泡放有少量红磷作脱氧剂，其作用原理的文字表达式为______，该反应得基本类型为______反应．
But if robots are to reach the next stage of labor-saving utility, they will have to operate with less human （） and be able to make at least a few decisions for themselves—goals that pose a real challenge.
A．interaction
B．supervision
C．availability
D．disposition
