單項(xiàng)選擇題

A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?（）

A.The motion of the apparent sun is along the ecliptic
B.Measurement of time is along the celestial equator
C.The speed of the Earth's revolution is not constant
D.There are variations in the Earth's rotational speed

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單項(xiàng)選擇題

A marine chemist issues gas free certificates and is certified by which organization? （）

A.Mine Safety Appliance Association
B.American Chemical Society
C.Marine Chemists Association
D.National Fire Protection Association

單項(xiàng)選擇題

A major health hazard of the product tert-butylamine is that it （）.

A.can be absorbed through the skin
B.causes irreversible damage to eye tissue
C.is a very unstable product
D.All of the above

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A mean sun is used as the reference for solar time for three reasons. Which reason is NOT a cause for use of a mean sun?（）

你可能感興趣的試題

A marine chemist issues gas free certificates and is certified by which organization? （）

A major health hazard of the product tert-butylamine is that it （）.

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