【判断题】加水至容量瓶的三分之二容积时,拿起容量瓶,按同一方向摇动,使溶液初步混匀,此时切勿倒转容量瓶。
【简答题】Spell the past tense of the word "magic".
【简答题】Spell the past tense of the word "notice".
【单选题】No light ____ in the house for the past two evenings, one of the neighbors broke in and found the old lady in her chair.
【单选题】The reason why there still needs improvement in the past view of Archaeopteryx is that
A.
fossils of those earliest birds haven't been discovered yet.
B.
the wishbone they studied is just so-called wishbone.
C.
there was no study of the role of its brain and some faculties in flight.
D.
Archaeopteryx is regarded as the earliest known bird.
【单选题】如果杂交后代表现出正反交结果不同,说明其属于?
【单选题】关于青霉素快速过敏试验法的描述,下列正确的一项是
D.
开启电源开关,待电流稳定后开动计时开关5分钟
【单选题】关于青霉素快速过敏试验法的描述,下列正确的一项是
C.
青霉素试验液浓度为每1 ml含青霉素5000 U
D.
开启电源开关,待电流稳定后开动计时开关5分钟