简述易错PCR技术进行体外基因突变的主要过程。
成本计算的辅助方法，一般应与基本方法结合起来使用，而不单独使用。
急死的诱因有哪些？（） 心肌肥厚。 情绪激动。 过度疲劳。 暴饮暴食。 冠状动脉硬化。
变压器差动不平衡电流是怎样产生的？
You are creating a Windows Communication Foundation (WCF) service that is implemented as follows. (Line numbers are included for reference only.) 01 [ServiceContract] 02 [ServiceBehavior(IncludeExceptionDetailsInFaults = true)] 03 public class OrderService 04 { 05 [OperationContract] 06 public void SubmitOrder(Order anOrder) 07 { 08 try 09 { 10 ... 11 } 12 catch(DivideByZeroException ex) 13 { 14 ... 15 } 16 } 17 } You need to ensure that the stack trace details of the exception are not included in the error information sent to the client. What should you do?（） Replace line 14 with the following line: throw;。 Replace line 14 with the following line: throw new FaultException(anOrder, ex.ToString());。 After line 05, add the following line: [FaultContract(typeof(FaultException))] Replace line 14 with the following line: throw ex;。 Alter line 05, add the following line: [FaultContract(typeof(FaultException))] Replace line 14 with the following line: throw new FaultException(anOrder, "Divide by zero exception"); 。
吊运物体时，为保证吊运过程中物体的稳定性，应使（）。
