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【单选题】
The passage suggests that bank managers failed to consider whether or not the service improvement mentioned ______.A.
was too complicated to be easily described to prospective customers.
B.
made a measurable change in the experiences of customers in the bank's offices.
C.
could be sustained if the number of customers increased significantly.
D.
was an innovation that competing banks could have imitated.
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举一反三
【简答题】已知系统的动态结构图如图9-9所示。 (1)列写系统的状态空间表达式。 (2)当初态x1(0)=1，x2(0)=-1，x3(0)=0，输入u是单位阶跃信号时，求状态x(t)的表达式及输出)，(2)的值。
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