若E-mail地址为:tsxxjs@126.com,那么它的用户名是()
A、tsxxjs
B、@126.com
C、126
D、com
参考答案:A
— My cat's really fat.
— You _____ have given her so much food. [ ]
A. wouldn't
B. couldn't
C. shouldn't
D. mustn't
舵机()通常不能产生声、光警报。
A.动力设备或控制系统的动力故障
B.自动舵装置故障
C.电路或电动机断相及过载
D.舵转动太慢