A:1200J
B:4800J
C:3600J
D:2400J
(____) Ottawa is the capital city of Canada.
(____) The CN Tower is very tall.
(____) It has five yellow stars.
(____) They speak English and French.
(____) I live in China.
在显微镜下把视野里物像从甲转化成乙,操作步骤有①移动玻片标本 ②调光圈 ③转动细准焦螺旋 ④转动转换器.其正确的操作顺序为( )
激素对人体的作用显著.幼年缺乏甲状腺激素和成年甲状腺激素分泌过多将分别导致( )