Update first_lab.md

docs/checklist/first_lab.md

@@ -8,7 +8,7 @@
 [x] Write AA meeting record table and email to AA `Y Song`   
 [] Learn Markdown & Git `All`   
 [x] Find all component models `B Yang`   
-[] Build all component models that not provided `B Yang`   
+[x] Build all component models that not provided `B Yang`   
 [x] Finish the circuit except the BPF and impedance `B Yang`   
 [] Simulate to get the BPF band range `B Yang, Y Liu`   
 [] Design BPF and insert to circuit `Y Liu`   
@@ -18,6 +18,6 @@
 ### optional
 
 [] Simulate the circuit and evaluate the result `Y Liu`   
-[] Design the circuit to be 50ohms `W Wen`   
+[x] Design the circuit to be 50ohms `W Wen`   
 [] Simulate the circuit `W Wen`   
-[] check and order the components we need `Y Liu`  
+[x] check and order the components we need `Y Liu`