下列实验操作正确的是
答案:A
B、收集二氧化碳用向上排空气法,长进短出,NO不能使用排空法;
C、稀释溶解过程只能在烧杯中操作;
D、易引起倒吸。
DMD的发病是由负责下述哪种蛋白合成的基因异常所致()
A.葡萄糖-6-磷酸酶
B.己糖胺酶B
C.肌球蛋白
D.抗肌萎缩蛋白
E.肌动蛋白
根据句意,用所给单词的适当形式填空。
小题1:Wall Street is at ___________ (south) end of Manhattan Island .
小题2:Germany and the UK are both ___________ (Europe) countries.
小题3:The local people had to move away because of the serious ___________ (pollute).
小题4:Nothing is ___________ (possible) if we put our hearts into it.
小题5:Each camel has two ___________ (stomach), so they can live in the desert for a long time.