数控操作工的五项纪律是：持证上岗；（）；遵守交接班制度；管好工具、附件；及时报告设备故障。
参考答案：保持机床整洁
Annie _______ to the party. She had a wonderful time with us.
A．invites
B．is invited
C．was invited
D．has invited
早期动脉粥样硬化病变，最早进入动脉内膜的细胞是
A．红细胞
B．淋巴细胞
C．脂肪细胞
D．嗜中性粒细胞
E．巨噬细胞
