The doctor had almost lost hope at one point, but the patient finally ______.
A:pulled out
B:pulled through
C:pulled up
D:pulled over
X、Y、Z、R、W是原子序数依次增大的五种短周期元素.Y和R同主族,可组成共价化合物RY2和RY3,Y和Z最外层电子数之和与W的最外层电子数相同,25℃时0.01mol•L﹣1 X和W形成化合物的水溶液pH为2,下列说法正确的是( )
人体可以自由活动的关节有哪些?
下列关于核酸的叙述中,正确的是