题目内容
用中子轰击铝27,产生钠24和X，钠24具有放射性，它衰变后变成镁24,则这里的X和钠的衰变分别是
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阅读理解：阅读下面的短文，根据文章内容从A、B、C三个选项中选出一个最佳选项。
Want to keep your staff motivated about learning new concepts？ The quality and variety of the employee training you provide are keys for motivation. Reasons to {A. offerB、B. completeB、C. take} employee training are many, from new-hire operational training to introducing a new concept to a work group to installing a new computer system.
{A. WhereverB、B. HoweverB、C. Whatever} your reason for conducting an employee training session, it’s critical to develop the employee training within the framework of a comprehensive, ongoing and consistent program.This employee training program is essential to keep your staff motivated about learning new concepts and {A. ultimateB、B. ultimatelyB、C. ultimation} keep your department profitable.
A complete employee training program includes a formal new hire training program with an overview of the job expectations and performance skills {A. needB、B. neededB、C. needing} to perform. job functions. A new hire training program provides a fundamental understanding of the position and how the position fits within the organizational structure.Another aspect of a comprehensive employee training program is continuing {A. continueB、B. continuedB、C. continuing} education. This is an important function in order to keep all staff members current about policies, procedures, and the technology.
物体从距地面H高处开始做自由落体运动，当其速度等于着地速度的一半时，物体下落的距离是
从高处释放一个小球，恰好压在正下方竖直放置的轻弹簧上，在小球的加速度为零的时刻，未达最大值的物理量是
存放固体烧碱，应使用
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