单项选择题

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某型号零件的内径设计尺寸为20mm,公差为(+0.15,-0.15)mm。某道工序承担该零件内径的最后加工,现需要通过随机抽样对该工序的工序能力进行评估,共抽取200个样本,经测算,该样本平均值和公差中心重合,标准差为0.08mm。根据以上资料,回答下列问题。

A.充足
B.正常
C.不足
D.严重不足
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SECTION A READING COMPREHENSION [25 MIN.]In this section there are four passages followed by questions or unfinished statements, each with four suggested answers marked A, B, C and D.Choose the one that you think is the best answer. Mark your answers on your answer sheet.TEXT AThe train clattered over points and passed through a station.Then it began suddenly to slow down, presumably in obedience to a signal. For some minutes it crawled along, then stopped; presently it began to move forward again. Another up-train passed them, though with less vehemence than the first onE.The train gathered speed again. At that moment another train, also on a down-line, swerved inwards towards them, for a moment with almost alarming effect. For a time the two trains ran parallel, now, one gaining a little, now the other. Mrs. McGillicuddy looked from her window through the window of the parallelcarriages. Most of the blinds were down, but occasionally the occupants of the carriages were visiblE.The other train was not very full and there were many empty carriages.At the moment when the two trains gave the illusion of being stationary, ablind in one of the carriages flew up with a snap. Mrs. McGillicuddy looked intothe lighted first-class carriage that was only a few feet away.Then she drew her breath in with a gasp and half-rose to her feet.Standing with his back to the window and to her was a man. His hands were round the throat of a woman who faced him, and he was slowly, remorselessly, strangling her. Her eyes were starting from their sockets, her face was purplE.As Mrs. McGillicuddy watched, fascinated, the end came; the body went limp and crumpled in the man’s hands.At the same moment, Mrs. McGillicuddy’s train slowed down again and the other began to gain speeD.It passed forward and a moment or two later it had vanished from sight.Almost automatically Mrs. McGillicuddy’s hand went up to the communicationcord, then paused, irresolutE.After all, what use would it be ringing the cord of the train in which she was travelling? The horror of what she had seen at such close quarters, and the unusual circumstances, made her feel paralyseD.Some immediate action was necessary,—but what?The door of her compartment was drawn back and a ticket collector said, “Ticket, pleasE.”66. When Mrs. McGuillicuddy’s train passed through a station, it___.A.gained speed suddenlyB.kept its usual speedC.changed its speedD.stopped immediately 
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In
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TEXT
C.Then
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66.
J.
A.