反时限过电流保护的优缺点

A. 正确
B. 错误

A. Garbage collection cannot be forced.
B. Call System.gc（）.
Call System.gc（）， passing in a reference to the object to be garbage collected.
D. Call Runtime.gc（）.
E. Set all references to the object to new values（null， for example）.

A. 正确
B. 错误