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【单选题】
Which of the following explains why supply is more elastic as more time passes?A.
It is difficult or impossible to increase the quantity produced in a short period of time.
B.
Consumers have more time to search for substitutes.
C.
Sellers try to take advantage of a high price in the short term.
D.
The supply curve becomes generally steeper as more time passes.
E.
There is no explanation for this phenomenon.
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举一反三
【单选题】An inert gas system is designed to reduce the possibility of tank explosions by（）.
A.
eliminating sparks and fire in the vicinity of cargo tanks
B.
removing all hydrocarbon gases from the cargo tanks
C.
blanketing cargo tanks with inert foam
D.
reducing the oxygen concentration below levels necessary for combustion
【简答题】请根据以下内容回答 90～91 题： 第 90 题 于强壮保健的要穴是（ ）
【单选题】The fresh air intake of the inert gas system（）.
A.
prevents the flue gas from falling below 3% content of oxygen
B.
allows the inert gas piping to be used for gas freeing the tanks
C.
opens when there is excessive vacuum on the deck water seal
D.
enables outside air to mix with and cool hot flue gasses
【单选题】The purpose of the deck seal in an inert gas system is to prevent（）.
A.
flammable vapors from entering machinery space
B.
flue gas escaping to atmosphere
C.
inert gas escaping to atmosphere
D.
air entering inert gas system
【单选题】The deck water seal of the inert gas system ______．
A.
Cools the inert gas and prevents soot from entering the cargo tanks
B.
Acts as an emergency shutdown when inlet pressures exceed the safe working pressure
C.
Prevents the backflow of hydrocarbon gasses into nonhazardous areas
D.
Relieves sudden large overpressures in the system
【单选题】. 在玻璃 ( 折射率 n 2 = 1.60) 表面镀一层 MgF 2 ( 折射率 n 2 = 1.38) 薄膜作为增透膜.为了使波长为 500 nm(1nm=10 9 m) 的光从空气 ( n 1 = 1.00) 正入射时尽可能少反射, MgF 2 薄膜的最少厚度应是
A.
78.1 nm
B.
90.6 nm
C.
125 nm
D.
181 nm
【单选题】The deck water seal of the inert gas system（）.
A.
cools the inert gas and prevents soot from entering the cargo tanks
B.
acts as an emergency system shutdown when the inlet pressures exceed the safe working pressure in the hazardous zone
C.
prevents the backflow of hydrocarbon gasses into nonhazardous areas
D.
relieves sudden large overpressures in the system
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