Hainan is _____ island, isn't it?
查看答案
He has _____ great deal of interest in _____English.
A. a, an
B. the, the
C. a, /
What do you usually do after ____ ？
A. the class
B. class
C. the classes
There are _____ few mistakes in your note. Don't make _____ same mistake again.
A. a, a
B. a, the
C. the, the
以下哪个高阶系统可以近似看作一阶系统
A. （s+2）/（s^2+2s+2）(s+7)
B. 4.2*0.64/(s^2+s+0.64)(s+4.2)
C. 1/(0.67s+1)(0.01s^2+0.08s+1)
D. (0.59s+1)/(0.67s+1)(0.01s^2+0.08s+1)
微信支付 
支付宝支付