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问题 单项选择题

螺旋油泵与电动机联接法兰之间的中心要求是（）

A.平面<0.10mm，园周<0.20mm

B.平面<0.15mm，园周<0.12mm

C.平面<0.08mm，园周<0.10mm

答案

参考答案：B

填空题

根据以下甲、乙两种微粒的结构示意图填空．

（1）属于离子的是______（选填“甲”或“乙”）．

（2）两种微粒核外都有______个电子层；甲的最外层电子数是乙的最外层电子数的______倍．
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68. The text is most probably from __
A. a newspaper       B. a magazine         C. a website           D. a novel
69. Which of the following parts has the least posts?
A. Chit-chat.         B. Music and Radio.    C. Lifestyle.          D. Film and Cinema.
70. Which of the following categories attracts the most attention?
A. Stores, shopping & Rentals.                      B. TV Series, Shows and Programs.
C. Sports and Games.                             D. Music and Radio.
71. If you want to talk about Micale Jackson, you'd better go to
A. Lifestyle          B. Music and Radio     C. Chit-chat          D. Film and Cinema
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