网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
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
参考答案
参考解析
解析：
暂无解析
更多 “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 nanometersB 0.6 nanometersC 0.8 nanometersD 1.2 nanometersE 1.6 nanometers” 相关考题
考题
More recently, lasers have been used to () skin discolorations.
A.takeB.removeC.recoverD.move
考题
The overall transfer function is the ratio of the transform. of the controlled variable to the transform. of ( ).
A.the controlled variableB.the reference inputC.the feedbackD.the output variable
考题
A feedback is an input ____A.which governs the state of a variableB.which provides a visual and audible alarmC.which indicates values of controlled variablesD.which measures the state of the controlled variable
考题
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 nanometersB. 0.6 nanometersC. 0.8 nanometersD. 1.2 nanometersE. 1.6 nanometers
考题
What is the phenomenon called where different wavelengths of light travel at different speeds?()
A.OSNRB.dispersionC.light skewD.attenuation
考题
There are some speaking activities. Which of the following mainly focuses on the form and accuracy?
A．Controlled activities.
B．Semi-controlled activities.
C．Communicative activities.
D．Problem-solving activities.
考题
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 nanometersB、0.6 nanometersC、0.8 nanometersD、1.2 nanometersE、1.6 nanometers
考题
Most electronic devices of this kind，（）manufactured for export，are tightly packed.A、that areB、as areC、which isD、it is
考题
When deployed to transmission application of wavelengths up to 160 wavelengths, the ZXWM M900 performs optical amplification of signals at the C band and the L band independently at the same time.
考题
In optical transmission systems， chirped lasers are used for the purpose of：（）.A、Turning the laser to a specific ITU channelB、Keeping the signal wavelength "locked" to a specific technologyC、Suppressing FWM and SBS non-linear effectsD、None ofthe above
考题
单选题Most electronic devices of this kind，（）manufactured for export，are tightly packed.A
that areB
as areC
which isD
it is
考题
单选题The NIF process of nuclear fusion involves ______.A
high lab temperatures of about 10 million CelsiusB
ultra powerful lasers being used to produce huge gravitational pressureC
deuterium and helium being fused together to form tritiumD
delivering ultraviolet energy to hit the target
考题
单选题The author states that the will and the passions of the people _____.A
can be effectively controlled by the people themselvesB
should determine government policiesC
can be controlled only by a power that exists apart from the people and is not subject to that will and those passionsD
cannot be controlled
考题
单选题What is the phenomenon called where different wavelengths of light travel at different speeds？（）A
OSNRB
dispersionC
light skewD
attenuation
考题
单选题What is the phenomenon called where different wavelengths of light travel at different speeds?（）A
OSNRB
dispersionC
light skewD
attenuation
考题
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 nanometersB
0.6 nanometersC
0.8 nanometersD
1.2 nanometersE
1.6 nanometers
考题
单选题In the starting system, the automatic valve is controlled by（）, and the cylinder start valves are controlled by（）A
pilot air；pilot airB
handle；solenoidC
handle；pilot air coming through the distributorD
solenoid；pilot air coming through the distributor
考题
单选题If remote-controlled cars are more expensive than mechanical cars, and radio-controlled cars are more expensive than remote-controlled cars, which of the following statements must be true?A
Mechanical cars are the most expensive.B
Radio-controlled cars are the most expensive.C
Radio-controlled cars are cheaper than remote-controlled cars.D
Mechanical cars are more expensive than remote-controlled cars.
考题
单选题A common rail engine has only one or two high pressure pumps in operation at the same（）time, and the injection into each cylinder.A
can’t be controlled very preciselyB
can’t be controlled as flexibly as the separate pump systemC
can be controlled as flexibly as the separate pump systemD
can be controlled more precisely and flexibly
考题
单选题The air distributor is conventionally driven by（） and distributes into each cylinder by（） certain sequence.A
camshaft；fresh airB
camshaft；starting airC
electronic motor which is controlled by a computer；fresh airD
electronic motor which is controlled by a computer；starting air
热门标签
最新试卷