【单选题】He must be helping the old man to water the flowers, _____? [ ]
【单选题】He must be a student,_______?
【简答题】when a call what are the "do's"?
【单选题】肺灌注常用显像剂 99mTc-MAA ,其颗粒大小为
【单选题】It was ______________news that we all excited at it.
【判断题】It is polite to use"could"or "may" when making a call.
【简答题】when a call what are the "don't?
【简答题】99m Tc-MAA在制备和注射时,应注意的事项有哪些?