Simulation and experimental studies _____, which show that the axial ratio bandwidth of the antenna is directly proportional to the thickness of the substrate.? have been performed|;is performed;;|was performed;;|were performed;
举一反三
- Which of the following positions must the patient be in, when being performed CPR
- Hearing is the ability performed by (______) to detect (______).
- When was the Tibetan opera performed?
- 智慧职教: Which of the following should not be performed by the holder of a GMDSS GOC certificate?
- Lang Lang, the famous __________, once performed