厚度为3~5mm的净片玻璃可直接使用的部位是()。
A. 有框门窗
B. 隔断
C. 橱窗
D. 无框门
对建筑物内疏散通道情况不熟悉的人来说,保证安全疏散的最小能见距离为()m。
A. 5
B. 10
C. 20
D. 30
Before leaving port on an ocean tow,a tug captain should assure himself of all the following EXCEPT().
A. the towing hawser can be released quickly in an emergency
B. the correct navigation lights are rigged and operable on the tug and tow
C. an insurance underwriter has prepared a pre-sailing survey
D. a pick-up wire has been rigged on the tow in case of a breakaway
根据图样或利用样、样杆等直接在材料上划出零件形状加工界线的工作,称()。
A. 废料
B. 定料
C. 原料
D. 号料