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A milling operation in which the work moves in the same direction as the rotating cutter is____ milling. 

Pioneers in the development of early commercial synthetic plastics struggled with ____. ​

​In a tumbling-barrel process, the smoothing agent is a(n) ____ and a lubricant.

Induced fracture methods for cutting plastics are similar to those for cutting ____. 

Which event contributed to a surge in the development of plastics? 

Types of actions that are not of immediate danger but may lead to injury if repeated over days, weeks, and months are associated with ____. 

One of the first synthetic plastics was discovered by Dr. Leo H. Baekeland as a result of the chemical reaction of phenol and ____.

Automatic sorting systems detect the chemical makeup of material, such as the ____ systems that detect opacity.

Problems possibly linked with poor working conditions such as anxiety and irritability, substance abuse, sleeping difficulties, headaches, and gastrointestinal symptoms are classified as resulting from a(n) ____ hazard. 

The simplest endocrine control system directly responds to changing blood levels of ions and nutrients to stimulate hormone secretion. Which of the following is this simplest endocrine control system?