在方框图中,引出点和综合点进行前后移动,它们方法一致吗?
A. 是
B. 否
系统的数学模型有哪些？
A. 微分
B. 传递函数
C. 信号流程图
D. 方框图
________no bus, we had to walk home.
A. There is
B. There being
C. As there being
D. There be
________, the text became easier for us to learn.
A. New words explained
B. New words being explained
C. New words are explained
D. New words was being explained
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