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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。
标志世界新闻学走向成熟的两部代表性作品是《新闻学原理》和()。 ["《报刊的四种理论》","《德国新闻事业史》","《舆论学》","《实用新闻学》"]
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."]
滤波电路的作用是"通直流,阻交流"。
证据和证据材料有何区别?