()是运动训练活动的主体。
A.训练内容;
B.训练方法手段;
C.训练条件;
D.运动员和教练员。
参考答案:D
Professor Smith, along with his assistants,______ on the project day and night to meet the deadline.
A.work
B.working
C.is working
D.are working
下面的哪个方法是用于安排开发进度的()
A.PERT技术
B.自项向下估计
C.类比估计
D.参数估计