在TFX1型防滑系统中，当显示器上数字显示为（），说明防滑系统良好。
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对于焊接引起的整体变形，矫正工作是很困难的，甚至是（）的。
以下哪些行业不属于现代服务业（）
A. 饮食业
B. 教育业
C. 房地产业
D. 租赁和商务服务业
（）is not a vessel restricted in her ability to maneuver．
A vessel engaged in laying，servicing or picking up a navigation mark，submarine cable or pipeline
B. A vessel engaged in dredging，surveying or underwater operations
C. A vessel engaged in replenishment or transferring persons，provisions or cargo while underway
D. A power driven vessel which because of her draught in relation to the available depth and width of navigation water is severely restricted in her ability to deviate from the course she is following
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