These comments came specific questions often asked by local newsmen.
A:in memory of
B:in response to
C: in touch with
D: in possession of
因为23+34=57,所以57-23=34。(判断对错)
第一步:将集气瓶容积划分为五等份,并做好标记.
第二步:点燃燃烧匙内的红磷,伸入集气瓶中并把塞子塞紧.
第三步:待红磷熄灭后,打开弹簧夹,发现水被吸入集气瓶中,进入集气瓶中水的体积约为集气瓶总容积的 15 .