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双膜模型的要点

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写出相际传质速率方程

Fill in the blanks with proper words given belowcorresponds, discrepancies, amendments, validity, urge1. Sometimes it is necessary to _____1______ the buyer to open the L/C.2. Once the seller has received the L/C, the first thing he should do is to check if it _____2____- with the agreement or contract.3. When _____3_____ or errors occur, the seller should require ______4_____ to be made accordingly.4. The L/C should have a time of _____5______, which generally last 15 to 20 days after the time of shipment

下列关于投影仪的描述中错误的是

ANSI流明是投影仪投射在银幕上的光亮度的单位。
B. 投影机的均匀度越好,画面呈现效果越好。
C. DLP投影仪的色彩饱和度比LCD投影仪更好。
DLP投影仪的清晰度比LCD投影仪更高。

下列关于投影仪的使用方法中正确的是

A. 教室中常用的投影方式是背投影。
B. 关闭投影仪时,要按2次遥控器电源键。
C. 选择信号输入源的按钮为INPUT/Source键。
D. 按下遥控器的Freeze按钮,将暂时停止投影,屏幕变成黑屏。

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