磁共振成像系统有哪些？
参考答案：
磁共振成像扫描机，包括五个系统：①主磁体；②梯度磁场；③射频发射线圈；④接收线圈；⑤计算机图像重建系统。
The boy read the article ________ and found something important in it. [ ]
A. careful enough
B. carefully enough
C. enough careful
D. enough carefully
保证安全的组织措施是什么？
