For lasers with tightly controlled wavelengths, approximately how far apart are the centers of adjacent wavelengths when 100 GHz spacing is used in a DWDM system?（）..

第1题

[单选题] A company printer is used to print payroll checks on paper forms with carbon backing. Which ofthe following is the BEST type of printer for this scenario?（）

A、Laser B、Impact C、Inkjet D、Thermal

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第2题

[单选题] An office laser printer is printing lighter in random areas. Which of the following is the EASIEST solution to implement for this issue?（）

A、Clean the drum with a computer vacuum. B、Replace the toner cartridge. C、Clean the fuser area with a lint free cloth. D、Use a can of compressed air to clean the pickup assembly.

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第3题

[单选题] How is a Thin Film filter fabricated?（）

A、The glass core is doped with an Erbium in periodic segments of the fiber. B、Layers of high index ?and low index ?material are deposited on a glass substrate. C、Thin layers of silica glass are placed onto wafers to produce a prism-like effect. D、Fiber is etched with an ultraviolet laser that is precisely spaced for specific wavelength filtering.

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第4题

[单选题] For lasers with tightly controlled wavelengths， approximately how far apart are the centers of adjacent wavelengths when 100 GHz spacing is used in a DWDM system？（）

A、 0.4 nanometers B、 0.6 nanometers C、 0.8 nanometers D、 1.2 nanometers E、 1.6 nanometers

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第5题

[单选题] A user installs a laser jet printer on a Windows XP desktop. The user states that Windows XPgeneric printer drivers were used. When the user prints a document, the pages are printing out with random symbols, letters, and numbers. Which of the following should the technician do?（）

A、Download manufacturer printer drivers B、Restart the printer spooler C、Check for Microsoft Windows updates D、Check Device Manager

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第6题

[] A laser printer displays ‘perform user maintenance’. The manufacturer’s information was not available when the user performed the maintenance, and the laser printer continues to display the maintenance code. Which of the following items needs to be performed?（） A laser printer displays ‘perform user maintenance’. The manufacturer’s information was not available when the user performed the maintenance, and the laser printer continues to display the maintenance code. Which of the following items needs to be performed?（）

A、A. The printer needs to be sent to the manufacturer for maintenance. B、B. The printer’s firmware needs to be updated. C、C. A printer system reset must be performed. D、D. The maintenance page counter must be reset.

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第7题

[单选题] A laser printer prints pages with a gray background. Which of the following is the MOST possible cause of the problem? （）

A、Transfer roller B、Paper type C、Print head D、Fuser

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第8题

[单选题] Vessels should be manned（）duly qualified officers and crew adequate（）ensure the safety of navigation.

A、by/to B、with/to C、with/for D、from/for

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第9题

[] When does auxiliary burner of incinerator put into operation? （） Ⅰ. start incinerator when it is cold Ⅱ. the sludge for dealing with is little Ⅲ. the sludge for dealing with is large Ⅳ. the water and impurity in sludge are too much Ⅴ. the temperature in incinerator is low Ⅵ. dealing with little solid rubbish When does auxiliary burner of incinerator put into operation? （） Ⅰ. start incinerator when it is cold Ⅱ. the sludge for dealing with is little Ⅲ. the sludge for dealing with is large Ⅳ. the water and impurity in sludge are too much Ⅴ. the temperature in incinerator is low Ⅵ. dealing with little solid rubbish

A、A.Ⅰ+Ⅱ+Ⅲ+Ⅴ B、B.Ⅰ+Ⅱ+Ⅲ+Ⅳ C、C.Ⅰ+Ⅳ+Ⅴ+Ⅵ D、D.Ⅰ+Ⅱ+Ⅲ+Ⅵ

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For lasers with tightly controlled wavelengths, approximately how far apart are the centers of adjacent wavelengths when 100 GHz spacing is used in a DWDM system?（）

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