我国规定屏蔽服的屏蔽效率不应小于()dB
A.70
B.40
C.45
D.50
参考答案:B
Too often we underestimate the power of a touch, a smile, a kind word, or the smallest act of caring, all of which have the potential to _______ a life _______.
A.get… up
B.take… off
C.bring… up
D.turn… around
违法行为也是违反道德的行为。()