—Yes, I'm fond of YangYang. He plays a smart and handsome college student _______ is good at computer games.
A:which
B:what
C:that
D:when
联合国决定2011年为“国际化学年”(International Year of Chemistry),以纪念化学所取得的成就和增加公众对化学的欣赏和了解.下列观点或做法不符合这一宗旨的是( )
已知ω>0,函数fx=sinωx+π4在π2,π上单调递减,则ω取值范围是( )