【判断题】ceil()、floor()和round()方法返回的都是double类型的数。( )
【单选题】--- Will you go to the lecture this afternoon?----No. I_______ to the lecture before.A.listenedB.h
A.
7.--- Will you go to the lecture this afternoon? ----No. I_______ to the lecture before. A.listened
【单选题】The BBC dictionary differs from Oxford and Longman in that______.
A.
it has a wider selection of encyclopedic entries
B.
it is mainly designed to meet the needs of radio listeners
C.
it lays more emphasis on language than on culture
D.
it is intended to help listeners develop their listening comprehension skills
【单选题】Modern plant breading is largely based on planned hybridization combined with_____selection to speed up the evolution of new varieties.
【单选题】在做窝沟封闭时,一般乳牙酸蚀时间应该是( )
【单选题】互感系数M是衡量线圈之间互感现象( )物理量。