What are three relevant design considerations when using the 15216 EDFA? （）(Choose three.) dispersion。 Optical SNR。 span attenuation。 four wave mixing。 receiver sensitivity。
点火线圈主要由（）和（）等组成。
You just completed a manual open database backup. However there seems to be a problem with the database performance. You discover that the database is generating many log switches and the LGWR is consuming lots of CPU time. You have an idea of what the problem is and you begin looking at the information in V$BACKUP and in V$DATAFILE_HEADER. What do you suspect is the problem？（） A。 B。 C。 D。
润湿
抗精神病药治疗精神分裂症的原则，不符合的是（） 早期尽量合并用药。 快速加量。 药物剂量越高，治疗越彻底。 病情好转后，要坚持用药较长时间。 药物镇静作用越强，效果越好。
相对于基本建设工程，下列费用项目中，较能体现养护工程费用特点的费用项目是（）
