预注给药剂量一般为插管剂量的（）
A.1/2
B.1/3～1/4
C.1/5～1/10
D.1/15
E.1/20
参考答案：C
以“＞”或“＜”或“=”填空．
（1）20℃，1L水与1L酒精混合后的体积______2L．
（2）20℃，1g镁与1g稀硫酸充分反应后所得的溶液的质量______2g，
（3）20℃，1g硫粉在1g氧气中完全燃烧后生成的二氧化硫的质量______2g．
This new method of teaching for the time being in our school. It will be carried out all________over the city.
A. is experimenting B. is experimented C, is being experimented D. has been experimented
