【单选题】I am not sure that I can draw an exact line between wit and humor (perhaps the distinction is so subtle that only those persons can decide who have long white beards), but even an ignorant person may ...
A.
of no particular importance
B.
solely a matter of opinion
【多选题】有关核酸的杂交,下列叙述正确的是( )。
C.
不同来源的核酸复性时,若全部或部分碱基互补就可以杂交
D.
杂交可以发生在DNA与DNA之间,DNA与RNA之间以及RNA与RNA之间
【单选题】4个月小儿,按照计划免疫程序规律接种,此时护士应当为其接种
【单选题】4个月小儿,按照计划免疫程序规律接种,此时护士应当为其接种