技能的出场方式有哪些?
在音乐教学中需要把音乐经验先还原到幼儿原始经验有哪二层意思?
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主要用来切断介质通路,也可调节流量和压力的阀门是()。 ["球阀","疏水阀","截止阀","止回阀"]
public String makinStrings() { String s = “Fred”; s = s + “47”; s = s.substring(2, 5); s = s.toUpperCase(); return s.toString(); } How many String objects will be created when this method is invoked?() [" 1"," 2"," 3"," 4"," 5"," 6"]
如何解决城市天然气“气荒”?