执行任务时，如果学员能正确执行，但却不能完全理解原理，此时教员应该怎么做？ When perform a task, if trainees can perform correctly, but can NOT fully understand the principles, how should instructor do?
A.不要求学员改变操作 Do NOT require trainees to change the operation
B.要求学员运用同样的要素执行其他任务 Require trainees to use the same elements to perform other task
C.让学员停止操作并对操作原理进行示范 Ask studet to stop the operation and demonstrate the principle of operation
正确答案是C