【简答题】磁等价核是指分子中一组氢核,其______相同,且对组外任何一个氢核的______也相同。
【简答题】核磁共振波谱法中,产生共振吸收的条件为 及 。 2 、 自旋系统按偶合强弱分为 ______ ____ 和 _______ ___ 偶合, 一般以 ____ ____ 作为弱偶合的判别式 。 3 、磁等价核是指 ____ _______ 相同, 且对组外任何一个原子核的 ____ _______ 也相同的一组化学等价核 。 4 、由于核外电子运动产生的屏蔽效应称为 __________ _____...
【判断题】操作化就是将抽象概念转化为具体指标的过程。
【单选题】Why did Delta give the author's family credits?
A.
They took a later fight.
B.
They had early bookings.
C.
Their fight had been delayed.
D.
Their flight had been cancelled.
【判断题】操作化就是将抽象的概念转化为观测的具体指标的过程
【简答题】Why did the sponsor of the AB 2330 bill finally give in on the interest section? A) To put an end to a lengthy argument. B) To urge landlords to lobby for its passage. C) To cut down the heavy paperwo...
【判断题】操作化就是将抽象概念转化为具体指标的过程。