下列粗基准的选择原则错误的是（）。 A.选择不加工表面作为粗基_爱下问搜题

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问题单项选择题

下列粗基准的选择原则错误的是（）。

A.选择不加工表面作为粗基准

B.尽量选择平整和较大的表面作为粗基准

C.在加工时应重复使用一个粗基准

D.当零件上所有表面都需加工时，应选择加工余量最小的表面做粗基准

答案

参考答案：C

完形填空

选择正确单词完成下列短文。

       My name    1   Dan and I have two    2   , Bob and Ray. We like hamburgers    3    lunch. Bob and I    4
French fries but Ray   5   . I don't like   6   for breakfast.    7   Bob and Ray    8   . I like fruit for breakfast.
  9   really like chicken   10   salad for dinner.

( ) 1. A. is
( ) 2. A. brother
( ) 3. A. on
( ) 4. A. like
( ) 5. A. do
( ) 6. A. a egg
( ) 7. A. Or
( ) 8. A. do
( ) 9. A. They
( )10. A. or

B. am
B. sister
B. at
B. likes
B. don't
B. egg
B. And
B. don't
B. Them
B. but

C. are
C. sisters
C. for
C. eats
C. does
C. eggs
C. For
C. does
C. We
C. and

D. call
D. brothers
D. in
D. loves
D. doesn't
D. egges
D. But
D. doesn't
D. Us
D. of

单项选择题

男，55岁，因肺炎入院，应用抗生素和输液后，体温未下降，今晨出现呼吸急促、烦躁。体检：呼吸46次/分，血压100/70mmHg，脉搏100次/分，口唇有发绀，两肺闻及哮鸣音。

最可能是并发了

A．支气管哮喘

B．自发性气胸

C．ARDS

D．心肌炎