金属导管严禁对口熔焊连接；镀锌和壁厚小于等于2mm的钢导管可加套管熔焊连接。（）
参考答案：错
肌萎缩脊髓侧索硬化症
A．压缩骨折B．横骨折C．斜骨折D．粉碎性骨折E．嵌插骨折
There are ____ things more important to society than educating children and providing healthcare to families.[ ]
A. few
B. a few
C. more
D. many
