【填空题】【消耗次数：1】
原子核的[填空1]是原子核具有磁矩的原因，自旋量子数为I的原子核在磁场中空间取向有[填空2]种。核磁共振的发生条件为 ，其中 指的是[填空3]， 指的是[填空4]。
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【填空题】
核素按照原子核的稳定程度分为稳定性核素和[填空1]核素，同位素是指[填空2]数相同和质量数不同的核素。
随机题目
【单选题】
The car salesman took the customer for a driver in the new model in order to ___ its improved features.
①
advocate
②
demonstrate
③
exhibit
④
reveal
【单选题】
I caught a___ of the car before it disappeared around the bend.
①
glance
②
glimpse
③
glare
④
stare
【单选题】
Alice ___her father that both she and her husband would be happy if he would live with them.
①
convinced
②
reinforced
③
pledged
④
required
【单选题】
Never in my wildest dreams ___ these people are living in such poor conditions.
①
I could imagine
②
?could I imagine
③
?I couldn’t imagine
④
?couldn’t I imagine
【单选题】
It was ___ back home after the experiments.
①
not until midnight did he go
②
until midnight that he didn’t go
③
not until midnight that he went
④
until midnight when he didn’t go
【判断题】
Mark often attempts to excape to be fined whenever he breaks traffic regulations.
①
正确
②
错误
【单选题】
The patients believe that the doctor knows exactly how to put them ___.
①
right
②
correct
③
perfect
④
well
【判断题】
It was because he was too clumsy to drive a car that Jim hadnt learned to drive.
①
正确
②
错误
【单选题】
Half of the workers here ___ under 30 ___.
①
is/years
②
are/year old
③
is/years old
④
are/years of age