皮皮学，免费搜题
登录
搜题
【简答题】
设图所示电路所加输入电压为正弦波。试问: (1) (2)画出输入电压和输出电压 、 、 的波形;
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】. With their son ______ a foreign college now, the parents have some financial problems now and then.
A.
to attend
B.
attending
C.
attended
D.
having attended
【单选题】College loans are now much harder to obtain. _________, most college students must work at least part time.
A.
Furthermore
B.
Similarly
C.
Consequently
D.
However
【单选题】Most college students think it ___ suitable jobs now.
A.
difficulty in finding
B.
difficult in finding
C.
difficulty to find
D.
difficult to find
【单选题】When I was at college , I _____ two foreign languages but I _____ most now ..
A.
learnt; had forgotten
B.
learnt ; have forgotten
C.
have learnt ; forgot D have learnt ; have forgotten
相关题目：
参考解析：
知识点：
题目纠错 0
发布
