PARACEL:N TO NE 6 AND UP TO 10 IN NA. 4000 M IN FRQ SQUALLY SHWRS AND TS. SEA 2 M AND UP TO 8-9 IN NA. SWELL E TO NE 4-5. FROM the above broadcast, the visibility will be ______.A.goodB.very goodC.poorD.moderate
PARACEL:N TO NE 6 AND UP TO 10 IN NA. 4000 M IN FRQ SQUALLY SHWRS AND TS. SEA 2 M AND UP TO 8-9 IN NA. SWELL E TO NE 4-5. FROM the above broadcast, the visibility will be ______.
A.good
B.very good
C.poor
D.moderate
相关考题：
RYUKYU S TO SE 6 BEC 4－5．ISOL SHWRS．SEA 3 M BEC 2 M．SWELL SE 3－4M．This description is likely to be under the heading of ______.A.FORECASTB.GALE WARNINGC.SYNOPSISD.STORM WARNING
SCARBOROUGH= W TO SW UP TO 10 IN N．500 M IN HVY SQUALLY SHOWERS AND TS．SEA 7-8 M．SWELL SW 5-6 M．The visibility in this area is ______．A.10 NMB.500 MC.7-8 MD.5-6M
共用题干Late-Night DrinkingCoffee lovers beware .Having a quick"pick-me-up"cup of coffee late in the day will play havoc with your sleep.As well as being a stimulant,caffeine interrupts the flow of melatonin,the brain hormone that sends people into a sleep.Melatonin levels normally start to rise about two hours before bedtime.Levels then peak be-tween 2 a.m.and 4 a. m.,before falling again."It's the neurohormone that controls our sleep and tells our body when to sleep and when to wake,"says Maurice Ohayon of the Stanford Sleep Epidemiology Research Center at Stanford University in California. But researchers in Israel have found that caffeinated coffee halves the body's levels of this sleep hormone.Lotan Shilo and a team at the Sapir Medical Center in Tel Aviv University found that six vol- unteers slept less well after a cup of caffeinated coffee than after drinking the same amount of de-caf（脱因咖啡）.On average , subjects slept 336 minutes per night after drinking caffeinated cof-fee,compared with 415 minutes after decaf. They also took half an hour to drop off-twice as long as usual-and jigged around in bed twice as much.In the second phase of the experiment,the researchers woke the volunteers every three hours and asked them to give a urine sample,Shilo measured concentrations of a breakdown product of melatonin .The results suggest that melatonin concentrations in caffeine drinkers were half those in decaf drinkers.In a paper accepted for publication in Sleep Medicine,the researchers suggest that caffeine blocks production of the enzyme that drives melatonin production.Because it can take many hours to eliminate caffeine from the body,Ohayon recommends that coffee lovers switch to decaf after lunch. The author mentions" pick-me-up" to indicate that______.A: decaf is a caffeinated coffeeB: coffee is a stimulantC: neurohormone can wake us upD:melatonin levels need to be raised
对于PN结,设P区电位为Up、N区点位为UN,说法正确的是： （)。A．Up＞UNB．Up＜UNC．Up≥UND．Up≤UN