【单选题】网球比赛中,运动员每一分有几次发球机会 ( )
【单选题】____ to the surprise of the teachers, the naughty boy turned out to be the person who saved the dying girl.
【单选题】With the termination of the uncertified teachers and the expected retirement of hundreds more, school system officials said they could have up to 750 vacancies this summer, which would be almost doubl...
A.
Retirement of teachers.
B.
Dismissal of uncertified teachers.
C.
Resignation of uncertified teachers.
D.
Disputes between the administration and the teachers.
【单选题】【例题•单选题】下列各科目的期末余额,不应在资产负债表“存货”项目列示的是( )。
【单选题】正规网球比赛中,运动员每一个球有几次发球机会?每盘是多少局?每局多少分?
【单选题】对于短波通信,以下说法错误的是________。
D.
白天电子浓度大应使用较高频率;夜间电子浓度小,使用较低频率