防爆电动机接线时，弹性密封垫切割后，剩余径向厚度应在（）以上。
A.2mm
B.3mm
C.4mm
D.5mm
参考答案：B
PowerLogic进入元件封装的是（）。
A.Partattributemanager
B.PartEditor
C.PartNew
The old gentleman ______ to be an old friend of his grandfather’s.
A. turned in B. turned over C. turned up D. turned out
