【单选题】闭式胸膜腔引流,关于拨管下列哪一项是错误的
A.
拨管 24 小时内重点观察病人呼吸情况及伤口情况
C.
拨管时先拆去固定缝线,嘱病人深呼气后屏气迅速拨除导管
E.
引流液明显减少,肺膨胀良好,无漏气现象,在术后 24 ~ 48 小时即可拨除引流管
【单选题】Chargaff's rules state that in typical DNA:
【单选题】()是依照验收标准对到货的药品进行抽样开箱检查的过程
【简答题】A.J-(R-S) B.R-(R-S) C.(A-OUS D.RU(R-S)
【简答题】One of Chargaff's rules states that the amount of cytosine is equal to the amount of _________________in DNA
【单选题】Chargaff's rules state that ( ).
A.
in the DNA molecule the number of adenines = number of thymines and the number of guanines = number of cytosines
B.
in the DNA molecule the number of guanines and cytosines = the number of adenines and thymines
C.
the ratio of (A + T)/(G + C) is constant for a species