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How many basic units are in the SI system?

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The SI system has seven basic units, it's a metre (length), kilogram (mass), second (time), ampere (electrical current), kelvin (temperature), candela (luminous intensity & mole (amount of substance)
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flagEstonia
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7%
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flagthe Netherlands
9%
81%
0%
9%
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flagAustria
7%
69%
12%
10%
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flagPakistan
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19%
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flagIndia
15%
54%
11%
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flagAustralia
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flagGermany
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50%
20%
12%
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flagNigeria
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flagthe United Kingdom
14%
49%
14%
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flagPoland
11%
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21%
17%
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flagUnknown
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21%
8%
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flagthe Philippines
21%
47%
10%
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flagthe United States
14%
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flagCanada
23%
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17
flagRepublic of Ireland
6%
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15
flagSwitzerland
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flagMalaysia
38%
23%
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flagGreece
23%
15%
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What was used as a unit of mass in the classical times?

carob seed
a drop of lead
handful of sand
swallow's egg

When did the USA introduce the metric system as preferred for weights and measures?

never
1805
1866
1975

What units are used to measure the bitterness of beer?

EBC
IBU
Plato
BLG

What is this B-52 bomber doing?

it's dropping fuel
it's burning
it's taking-off
it's dropping chemical weapon