DK.SW型闭路式道口控制器工作灵敏度,轨道继电器吸起电阻(),轨道继电器落下电阻()。
A. 1.6-2.6Ω;≥吸起电阻的40%
B. 1.7-2.7Ω;≥吸起电阻的50%
C. 1.7-2.7Ω;≥吸起电阻的60%
D. 1.6-2.6Ω;≥吸起电阻的70%
If a shipper has strict arrival and departure requirements, which kind of transport mode he should consider firstly?()
A. Railroad
B. Motor
C. Both of them
D. Neither of them
YB95型条盒透明纸包装机操作人员按下包装材料选择按钮后选用包装纸,不按则选用透明纸。
A. 正确
B. 错误
左耳气导大于骨导,Weber试验偏向右,Schwabach试验左耳骨导较右侧缩短,耳聋的性质为()。
A. 左耳传导性耳聋
B. 右耳传导性耳聋
C. 右耳神经性耳聋
D. 左耳神经性耳聋
E. 混合性耳聋