【单选题】A vessel showing a yellow light over a white light at night is a vessel ().
【单选题】A vessel trawling will display a ______.
A.
red light over a white light
B.
green light over a white light
C.
yellow light over a red light
D.
white light over a green light
【单选题】下列关于利用组合化学和高通量筛选得到先导化合物相关内容说法错误()
A.
组合化学的化合物库的构建,是将一些基本的小分子,比如氨基酸、核苷酸、单糖等,通过化学和生物合成的手段装配成不同的组合
C.
得到大量具有结构多样性的化合物,同时配合高通量筛选,寻找先导化合物
D.
高通量筛选是利用近二三十年来生物化学,分子生物学,分子药理学和生物技术的研究成果,对于阐明影响生命过程的一些环节的酶、受体、离子通道等作为药物作用的靶标进行分离、纯化和鉴定
【单选题】On a chart, the characteristic of the light on a lighthouse is shown as flashing white with a red sector. The red sector ______.
A.
indicates the limits of the navigable channel
B.
indicates a danger area
C.
is used to identify the characteristics of the light
D.
serves no significant purpose
【简答题】White light (4000Å~7000Å) falls on a soap bubble (thickness t=3000Å, n=1.3).Light at which wavelength is maximally strengthened in the reflecting light?λ = __________ Å
【多选题】signa l can be used in
【单选题】当NC故障排除后,按RESET键( )。
【单选题】A vessel showing a green light over a white light in a vertical line above the level of the sidelights is ______.
A.
engaged in underwater construction