To investigate the influence of enhanced UV-B radiation on chlorophyll fluorescence characteristics of soybean,pulse amplitude modulation fluorometer was employed to measure the fluorescence parameters and rapid light curves during different growth stages under the condition of simulating 20% enhancement of UV-B.
利用脉冲振幅调制叶绿素荧光仪测定大豆不同生育期叶片的荧光参数和快速光曲线,以研究UV-B辐射增强对大豆叶绿素荧光特性的影响。
shutter speed priority automatic exposure
快门速度优先式自动曝光照相机
aperture-priority automatic exposure camera
光圈优先式曝光量自动控制照相机
automatic exposure programmed shutter 135 camera
装有自动曝光程序快门的135式照相机
If the aperture is changed while an exposure value is locked in Auto operation, the camera will adjust the shutter speed to correspond to the exposure value that is locked.
如在自动操作状态,曝光值被锁定时,又改变了光圈,相机将调整快门速度已对应被锁定的曝光值。
The self-timer mode is not only useful for self-portraits but also for shake-free exposures with show shutter speeds.
自拍模式不仅可以用于自身肖像的拍摄,也可用于快门速度较慢时的无抖动曝光。
The Auto Bracketing mode is not applicable when the shutter speed is set to“ bulb”.
当快门速度设置在B门时,不能用包围式曝光模式。
Another exposure mode offered by the K10 D is Shutter& Aperture-Priority AE( TAv) mode, which is designed to automatically select the most appropriate sensitivity for a user-selected shutter-speed& aperture combination.
也就是说，用户选择光圈和快门，然后相机根据不同光线条件自动调节感光度以获得正确的曝光。
Mathematical modeling and calculation on exposure time of curtain-type shutter
帘幕式快门曝光精度数学建模及计算
Research on the distribution of ultraviolet irradiance in an integral stereolithography system
面曝光快速成形系统中紫外光辐照度分布研究
Check the shutter dial and aperture ring to make sure you had the correct exposure.
检查快门速度光圈以确保正确的曝光量。
Check the shutter speed dial and aperture ring to make sure you have the correct exposure.
检查快门速度及光圈以确保正确的曝光量。
Look at the exposure indicator when setting the aperture and shutter speed.
当设定光圈和快门速度时,请注意曝光指示灯
The shutter speed flashes in the viewfinder display when the subject is underexposed or overexposed.
当被摄体呈欠曝光或过曝光时,快门速度将在取景器中起闪烁。
The amount of light that enters the lens can be controled by the length of time the camera shutter is open for (the exposure), and the width of the aperture (the fstop).
进入镜头光的总量可以由照相机快门打开时间的长短（曝光）和孔径的宽度决定。
Set the flash unit to auto mode and set the shutter speed below 190.
将闪光装置设置为自动模式并将快门速度调到慢于190。
Exposure,radiographic exposure
曝光,射线照相曝光
The shutter speed in the viewfinder display flashes when the current exposure setting is beyond the exposure metering range.
如当前曝光设定超过曝光测定范围,取景器显示中的快门速度将会闪烁。
needle-trap automatic camera
快门先决自动相机﹝指有测光系统辅助调校光圈的相机﹞