与企业日常生产经营相关的外包业务，主要有哪些。（）
A、研发
B、可行性研究
C、委托加工
D、客户服务
参考答案：A, B, C, D
A client who is 7 months pregnant reports severe leg cramps at night. Which nursing action would be most effective in helping her cope with these cramps（）
A. Suggesting that she walk for 1 hour twice per day.
B. Advising her to take over-the-counter calcium supplements twice per day.
C. Teaching her to dorsiflex her foot during the cramp.
D. Instructing her to increase milk and cheese intake to 8 to 10 servings per day.
如图，通电导线MN与单匝矩形线圈abcd共面，位置靠近ab且相互绝缘。当MN中电流突然减小时，线圈所受安培力的合力方向（）
A.向左
B.向右
C.垂直纸面向外
D.垂直纸面向里
