短筒取心起钻时，禁止用转盘卸螺纹，禁止猛刹猛提，猛坐转盘。
参考答案：对
Children have a natural ______ about the world around them. They are interested in everything.
A．concern
B．purpose
C．curiosity
D．strength
光缆测试选择光功率计的基本要求是什么?
