[化] 四氧化铯; 过四氧化二铯

[00:06.37]The United States has a new official clock. [00:10.95]The clock began operating late last year in the American city of Boulder,Colorado. [00:18.39]Experts say the new clock is so exact that it will neither gain nor lose so much as one secon

发表于:2018-12-26 / 阅读(142) / 评论(0) 分类 美国英语听力80篇

Youve given some thought to oxygen, carbon, uranium. But youve probably never mused about the element ytterbium, symbol Yb. A new study by scientists at the National Institute of Standards and Technology, or NIST, says that ytterbium could find a rol

发表于:2019-01-08 / 阅读(137) / 评论(0) 分类 Scientific American(八)月
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Acer eucalyptoides
Actinocarya tibetica
aivas
angular harp
aphis stranvaesiae
apposers
aspergillosis
back stand
backtack
battues
Bid. Ins.
big-water
boddens
brown bud method
Bālā Band, Chāh-e
characteristic variable
chrematophobia
compound larceny
CROSSOPTERYGIOMORPHA
da da
department of public works
depletion-mode field-effect transistor
dew-point pressure
directional gyrocompass
dmitries
don't judge a book by its cover
drawloom
Dutch Republic
Dynaplex
edge stitching
entoria banshoryoensis
etch cut
evaginated
fear of death
furnace depth
gallium(iii) telluride
genus Hovea
glue gun
Goniothalamus
gotzenite
healthy ship
heuristics in product layout
high speed steel lathe tool
high-speed correlator
hop skywave
impermanency
international referral system
interval histogram
Jerusalem cricket
kahu
Lagerstroemia venusta
latifah
lay oneself out to do sth
layuot
light nucleus
Litokhoron
litts
lock stitch sewing machine
lodge claims
look as if one has lost a shilling and found sixpence
lower frame
magnetic detection
microwave band
mixed semi conductor
modular art
monda
monetary base
mourning cloak
mushroom hair style
nonconformitan
official receiver
parkinsonisms
pass a verdict on
peachtree software
Pholidosaurus
Phyllagathis
pigra
plaisances
pressure vapour lamp
prodiginine
progressive bluegrass
propelling sheave
pull-up
punctureless
R. S. C.
rh-negative
ruggeder
scale factor potentiometer
sec'y
self-threading screw
series aiding connection
shop order
skaven
tank compartment
terrestrial photogrammetric camera
test access point
theory of triaxial earth
trichiurus haumela
ultimate limit states
variegation(schultz 1936)
Wakool R.
wired logic control