本文讨论控制器能量受限下一类无限维线性系统的精确零能控性问题，得到了这类能控性的充分必要条件。
In this paper the problem of the controllability of a class of infinite dimensional linear systems with control energy constraint is discussed.
必要而充分的条件是合外力矩能量小于最大限度的恢复能量，且合外力不等于零；
What is necessary is resultant moment energy is smaller than maximal rehabilitating energy and is not zero.
必要而充分的条件是合外力矩能量小于最大限度的恢复能量，且合外力不等于零；
What is necessary is resultant moment energy is smaller than maximal rehabilitating energy and is not zero.
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