A:don’t know; were
B:hadn’t known; are
C:haven’t known; are
D:didn’t know; were
下面哪一个单词对应的英文意思是错误的?()
Many students know what they want to be in the future* . We think boys are different from girls. Here is a survey in Green High School. Let's look at the diagram* .
标有“220V 100W”的灯泡,正常发光1min产生____ J的热量,1度电可供它正常工作____ h。