变压器是供配电系统中的重要设备,为此需要根据变压器容量大小及其重要程度装
设各种专用的保护,现有6300KVA/35/ 10.5KV变压器一台,哪几种保护是必需的:（）
A 定时限过电流
B 过电流速断
C 纵联差动
D 气体、温度监控

A. to describe recent environmental policy
B. to point out the difficulties inherent in protecting national parks
C. to call for the protection of national parks
D. to analyze the current status of national parks

A student who decides to not finish high school.
B. A student who plans on joining the Army.
C. A student who works while in high school.
D. A student who is proficient in reading.

A. One-tenth.
B. More than one-tenth.
C. Less than one-tenth.
D. The results were varied.