【单选题】88. 电位是( ),随参考点的改变而改变,而电压是绝对量,不随参考点的改变而改变。
【判断题】强制性产品认证制度简称CCC认证是英语China Compulsory Certification的缩写。
【单选题】在接触器互锁正反转控制电路中的互锁通常是在正反转接触器的前方都( )联上对方接触器的常闭接点 。
【单选题】What useful information can be drawn from the passage by a chronic Lyme patient?
A.
We are still not out of the woods in curing the disease.
B.
They should take cautions against being further infection.
C.
We have both traditional and new ways to treat the disease.
D.
They should keep alert while traveling in a Lyme-infected area.
【单选题】在接触器互锁正反转控制电路中的互锁通是在正反转接触器的上方都( )联上对方接触器的常闭接点。
【单选题】The twins are similar each other. [ ]
【单选题】We don’t look the same , _____ we are twins.
【单选题】Lucy and I are twins, but we’ re different ______ each other in many ways.
【单选题】在接触器互锁正反转控制电路中的互锁通常是在正反转接触器的上方 ( ) 上对方接触器的常闭接点。
【单选题】We don’t look the same, we’re twins.