车床主轴的轴向窜动,使车削的工件端面产生()误差。A.平面度  B.直线度  C.圆

阅读短文，根据短文内容填空。

     Mrs. Brown's grandfather lived with her and her husband. Every morning he took a walk in the park and

came home at half past twelve for lunch. But one morning a police car stopped outside Mrs. Brown's house

at twelve o'clock, and two policemen helped the old man to go out. One of them said to Mrs. Brown "The

poor man didn't find his way in the park and telephoned us for help, so we sent a car to bring him home."

Mrs. Brown was very surprised, but she thanked the policemen and they left. 

    "But grandfather," she said. "You go to the park every day. How did you lose your way there?" 

    The old man smiled, closed one eye and said, "I didn't quite lose my way. I just got tired and I didn't want

to walk home."

1. It was time for Mrs. Brown's grandfather to come home to                         at half past twelve every day.

2.                                  , Mrs. Brown saw a police car stopped outside her house one day morning.

3. "You often go to the park, how did you                         there?" Mrs. Brown said to her grandfather.

4. In fact, the old man was                                      he didn't want to go home on foot.

斜向上的物体经过最高点时，下列判断正确的是（　　）

A．速度是零

B．加速度是零

C．速度最小

D．加速度最小

银花与青霉素合用，可增强其对耐药金黄色葡萄球菌的抑制作用（）

单频单工制适用于用户少、专业性强的移动通信系统中。（）

借款人申请个人一手住房贷款，须具有当地户口及居所。