以下哪个事件图元可以放置到人工活动上()
A、错误中间件事件图元
B、开始时间图元
C、结束事件图元
D、取消中间件事件图元
参考答案:A
根据中文意思及句意,写山相应的单词。
1.How many colours are there in a _________ (彩虹)?
2.I'm busy these days, I haven't __________ (答复) to Jim's last e-mail.
3.colours Can change our __________ (心情).
4.Mr. Smith is 60 years old. But he is still _________ (精力充沛的).
5.Animals in forests are busy getting ready for the _________ (即将到来的) winter.
安健环体系有哪些关键环节?