[单选] 钢桩在场地堆放时，堆放高度最多为（）层。

排涝水位（最高水位）-计算步骤 A developer is creating a class Book that needs to access class Paper.The Paper class is deployed in a JARnamedmyLib.jar.Whichthree，taken independently，will allow the developer to use the Paper class while compiling the Book class？（） The JAR fileis located at$JAVA_HOME/jre/classes/myLib.jar.。 The JAR fileis located at$JAVA_HOME/jre/lib/ext/myLib.jar.。 TheJ AR fileis located at/foo/myLib.jar and aclasspath environment variable is set that includes /foo/myLib.jar/Paper.class.。 The JAR fileis located at/foo/myLib.jar and a classpath environment variable is set that includes/foo/myLib.jar.。 The JAR file is located at/foo/myLib.jar and the Book class is compiled using javac-cp/foo/myLib.jar/Paper Book.java.。 The JAR file is located at/foo/myLib.jar and the Book class is compiled using javac-classpath/foo/myLib.jar Book.java.。 西方经济学的分析方法有（） 边际分析。 规范分析。 均衡分析。 流量分析。 总量分析。 掺长 工程结构构件中，常常是由于垂直于横截面的（）引起材料的分离破坏、平行于横截面的（）引起材料的滑移破坏。 正应力；切应力。 切应力；正应力。 拉应力；切应力。 拉应力；正应力。 钢桩在场地堆放时，堆放高度最多为（）层。