在钢桥中,采用摩擦型高强度螺栓或剪切承压型高强度螺栓连接形式。二者在同样直径条件下,其对螺栓孔与螺栓杆之间的空隙要求,以下( )项为正确的
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧