问题
单项选择题
丝杠的螺纹厚度减薄量超过原来厚度的（）时，应更换。
A.1/2
B.1/3
C.1/4
D.1/5
答案
参考答案：C
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丝杠的螺纹厚度减薄量超过原来厚度的（）时，应更换。
A.1/2
B.1/3
C.1/4
D.1/5
参考答案：C
| 完形填空 | |||
| It is the middle of the day. Mother and Jack at table for 1 . There is some rice, bread and meat 2 the table. "I don't like any 3 . I don't want to eat it." says Jack. Mother says, "All right. Don't 4 it." After lunch mother goes to work in the field(田地) and Jack goes to school. 5 supper mother gives a bowl of rice to Jack again. "Oh, it is great!" says Jack. "It is the same rice." says Mother. "Is that so?" asks Jack. | |||
| ( )1. A. breakfast ( )2. A. in ( )3. A. bread ( )4. A. eat ( )5. A. At | B. lunch B. under B. meat B. give B. For | C. supper C. on C. rice C. want C. Have | D. eat D. behind D. noodles D. like D. Has |