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?
查看答案
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
Father came back, _______ a bag of money on his left shoulder.
A. he carried
B. he carrying
C. carrying
D. and carrying
微信支付 
支付宝支付