题目内容
（请给出正确答案）
instrument voltage regulator 意思是仪表电压调节器。()
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更多“instrument voltage regulator 意思是仪表电压调节器。（)”相关的问题
The following circuit is a differential voltage to current convertor. If it is needed to convert a voltage has range of 1 - 5V to a current range from 4 ~ 20 mA, the value of R =
？
A、500
B、250
C、125
D、400
The frequency of an alternator at a given r/min is determined by the _______ .
A.number of turns of wire in the armature coil
B.number of magnetic poles
C.strength of the magnets used
D.output voltage
Analyze the circuit shown below, If the op amps will saturate when their outputs voltage reach
12V, and output current reach
mA. What is the maximum value of
to avoid saturation？ if R=250
A、1.25V
B、1V
C、1.5V
D、2V
The term foreign exchange is best defined by the following statement: it is ______.
A．the rate of exchange between two currencies
B．synonymous with currency exchange
C．the place in which foreign currencies are exchanged
D．an instrument such as paper currency, note, and check used to make payments between countries
业务交际英语理解：把意义相同的英汉语句匹配到一起。
The following is a list of classifications of the pictures in a dictionary. After reading it, you are required to find those items given in Chinese in the below. Then you should put the corresponding letters in the brackets.
A—Television Engineering B—Musical Instrument
C—Household Appliances and Utensils D—Poisonous Plants
E—Road Construction F—Teaching Equipment and Information Technology
G—Conventional Sources of Energy H—Internal Combustion Engines
I—Agricultural Machinery J—Machine Tools
K—Power Plants L—Refuse Disposal
M—Stock Exchange N—Demonstration and Teaching Equipment
O—Main Exchange P—Medicinal Plants
Q—Historical Costumes R—Physical Geography
S—Types of Historical Carriages
Example：(E) 道路修筑 (A) 电视技术
() 机床 () 证券交易所
A、population inversion
B、flat band
C、strong inversion
D、. pinch off
A、voltage dependent K+ channel.
B、voltage dependent Na+ channel.
C、voltage dependent Ca2+ channel
D、Ach receptor cation channel.
E、chemical dependent Na+ channel.
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