我国矿产资源总的特点是什么？
您正在创建一个使用非托管资源的类，这个类保持在其它对象上的有管理代码您应该确保这个类的使用者能在这个类不再使用时释放资源您应该执行哪三个动作？（） 定义类使得该类继承于WeakReference类。。 定义类使得该类实现IDisposable接口。。 创建类析构函数，该函数在其他对象上调用方法来释放托管资源。。 创建一个释放非托管资源的类析构函数。。 创建一个Dispose方法，该方法调用System GC Collect来强制进行垃圾回收。。 创建一个Dispose方法，该方法释放非托管资源，并在其他对象上调用方法来释放托管资源。。
简述土壤肥力的相对生态性。
想象形式包括（） 再现性想像。 回忆性想像。 创造性想像。 理性的想像。
You are working as a network technician， study the exhibit carefully. Your boss has informed youthat there have been problems with the WAN that is using EIGRP routing protocol. You arerequired to troubleshoot these problems. Before going to the questions of this sim， we should have a quick review about GRE tunneling：GRE Quick Summary. The picture below shows how to configure a GRE Tunnel between two routers， notice that the"tunnel destination" must be the IP address of the interface， not of the opposite tunnel. Notice： The tunnel source on one router must be specified as the tunnel destination on the otherrouter. Below are the questions of this lab-sim. What is preventing the HQ router and the Branch1 router from building up an EIGRP neighborrelationship？（） When running EIGRP over GRE tunnels， you must manually configure the neighbor addressusing the eigrp neighbor ipaddress command。 The tunnel destination address is incorrect on the HQ router. It should be 10.2.1.1 to match theinterface address of the Branch1 router。 The tunnel source is incorrect on the Branch1 router. It should be serial 2/0。 The default route is missing from the Branch1 router。 The tunnel interface numbers for the tunnel between the HQ router and Branch1 router do notmatch。
酶分子定向进化的方法有（）
