眼球结构起感光作用的部位是().
A.视网膜
B.血管膜
C.照膜
D.虹膜
参考答案:A
— Is the meeting held in Room 302 or 303 ?
— It should be 302. But I hear that it _____ till tomorrow.
A.was put off
B.will put off
C.has been put off
D.is put off
注册商标有效期满,可以提出续展申请,续展申请的次数为()。
A.1次
B.3次
C.无数次
D.5次