CT扫描时,球管连续旋转曝光,检查床不停顿单向移动并采集数据的方式是()
A.步进扫描
B.螺旋扫描
C.间隔扫描
D.持续扫描
E.高速扫描
参考答案:B
The book written by Mo Yan is worth ______ a second time.
A.to read
B.to be read
C.reading
D.being read
影响授粉受精的因子有哪些?如何保证授粉受精的顺利进行。