题目内容
（请给出正确答案）
Loran-C is which type of system ________．
A.Reflected electron
B.Electrical radiation
C.Quarterpoint electrical navigation
D.Hyperbolic radio navigation
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Loran-C is which type of navigation system ________．
A.Hyperbolic，long-range navigation system
B.Short-range electronic
C.Long-range，high frequency navigation system
D.Long-range，with a frequency of 1950 kHz
Which one of the following amino acids can be converted to taurine？
A.His
B.Gly
C.Ser
D.Typ
E.Cys
167 Herzberg identified factors which, if present, will lead to increased motivation. A typical factor would be:
A. Good supervision
B. Job security
C. Regular promotions
D. Good salary
E. A dental plan
Loran-C uses the multiple pulse system because ______．
A.Less signal energy is necessary for receiver operation
B.More signal energy is available at the receiver
C.It significantly increases the peak power
D.It increases the signal capacity
A.Focus line
B.Base line
C.Side line
D.Center line
In using Loran-C，skywave reception gives greater range but is ______．
A.only accurate during daylight hours
B.much less accurate
C.only accurate at twilight
D.more accurate than using ground waves
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