学前儿童科学教育活动是指教师利用周围环境,为学前儿童提供材料和机会,使他们通过自身的感官去探索周围世界、获取信息、发现问题、寻找答案的一种活动。
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集体活动的设计,就是对科学教育活动的各个要素进行处理,从而形成特定的相互关系的过程。在制定科学教育目标时,首先要考虑的是学前儿童已有的经验水平;其次,是采用一些具体的方法来确定目标。
关于事中质量控制的说法,错误的是()。 ["事中控制包含自控和监控两大环节","要做到较好的事中控制必须建立和实施质量体系","事中控制强调监控,以自控为辅","事中控制强调自控,以监控为辅"]
Given the following code, which statements concerning the objects referenced through the member variables i, j and k are true, given that any thread may call the methods a, b and c at any time? () class Counter { int v = 0; synchronized void inc() { v++; } synchronized void dec() { v--; } } public class Q7ed5 { Counter i; Counter j; Counter k; public synchronized void a() { i.inc(); System.out.println("a"); i.dec(); } public synchronized void b() { i.inc(); j.inc(); k.inc(); System.out.println("b"); i.dec(); j.dec(); k.dec(); } public void c() { k.inc(); System.out.println("c"); k.dec(); } } ["i.v is guaranteed always to be 0 or 1.","j.v is guaranteed always to be 0 or 1.","k.v is guaranteed always to be 0 or 1","j.v will always be greater than or equal to k.v at any give time.","k.v will always be greater than or equal to j.v at any give time."]
简述液体粘性的产主。