贾谊,“太子之善,在于早喻教与选左右”。早,一是要行胎教,一是要实施()。
参考答案:学前教育
I can never forget the days________we worked together and the days________we spent together. [ ]
A. on which; when
B. which; when
C. what; that
D. when; which
SQ8杀菌剂为广谱高效杀菌剂,间歇性周期投加,质量尝试为()。
A.60-80mg/L
B.70-80mg/L
C.80-90mg/L
D.80-100mg/L