中国要强盛、要复兴，就一定要大力发展科学技术，努力成为世界重要科学中心和创新高地。自力更生是中华民族自立于世界民族之林的奋斗基点，自主创新是我们攀登世界科技高峰的必由之路。

An employee is paid on a piecework basis. The basis of ...

单项选择题 An employee is paid on a piecework basis. The basis of the piecework scheme is as follows: 1 to 100 units – 0.30 per unit 201 to 299 units – $0.40 per unit with only the additional units qualifying for the higher rates. Rejected units do not qualify for payment. During a particular day the employee produced 210 units of which 17 were rejected as faulty. What did the employee earn for their day's work?

各单位（）应定期检查和督促安全性评价部门整改计划完成情况。 A.每周B.每月C.每季度D.每年

单项选择题各单位（）应定期检查和督促安全性评价部门整改计划完成情况。

作业现场管理人员戴（）的安全帽。 A.白色B.蓝色C.红色D.黄色

单项选择题作业现场管理人员戴（）的安全帽。