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【单选题】
决定组合线在证券A与B之间的弯曲程度的是（ ）。A.
权重
B.
相关系数
C.
证券价格的高低
D.
证券价格变动的敏感性
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【多选题】The formation volume factor (FVF) of oil is ( )1; The formation volume factor (FVF) of water is ( )1; The formation volume factor (FVF) of gas is ( )1.
A.
≥1
B.
≈1
C.
≤1
D.
none of the above
【单选题】Ethanol is increasingly being used as a fuel for cars.The standard enthalpy change of formation of carbon dioxide is –393kJmol–1.The standard enthalpy change of formation of water is –286kJ mol–1.The ...
A.
–1921kJ mol–1
B.
–1367kJ mol–1
C.
–956kJ mol–1
D.
–402kJ mol–1
【单选题】A new kind of radar has been developed for spaceship travelers. A working laboratory model of a new system of radar that makes use of a beam of light is said to be ten thousand times more accurate tha...
A.
measures the movements of a spaceship by means of light beam
B.
makes use of microwaves
C.
makes use of sound waves
D.
Both A and B
【单选题】A new kind of radar has been developed for space-age travelers. A working laboratory model of a new system of radar that makes use of a beam of light is said to be ten thousand times more accurate tha...
A.
light
B.
microwaves
C.
sound waves
D.
both A and B
【简答题】听力原文：The new model has wider and more comfortable seats，with foot-and leg-rests to comfort the body over long haul of flights．Besides，the redesigned working environment has met the approval of many ex...
【单选题】The enthalpy change of formation of carbon dioxide is –394kJ mol–1.The enthalpy change of formation of water is –286kJmol–1.The enthalpy change of formation of methane is –74kJ mol–1. what is the enth...
A.
–892kJ mol–1
B.
–606kJ mol–1
C.
+606kJ mol–1
D.
+892kJ mol–1
【单选题】A new kind of radar has been developed for spaceship travelers. A working laboratory model of a new system of radar that makes use of a beam of light is said to be ten thousand times more accurate tha...
A.
measures the movement of a spaceship by means of light beam
B.
makes use of microwaves
C.
makes use of sound waves
D.
both A and B
【单选题】Given 1.00 g of an unknown sulfate salt, ASO 4 , the following steps are performed: 1. The salt is dissolved in water 2. An excess of BaCl 2 is added resulting in the formation of a precipitate 3. The...
A.
Mn 2+
B.
Mg 2+
C.
Fe 2+
D.
Pb 2+
E.
Zn 2+
【单选题】An electrical appliance company has submitted a new model of washing machine for stress and durability testing. After the conventional round of tests, 26 of the 90 machines tested no longer functioned...
A.
When the number one rated washing machine was submitted for stress and durability testing, 96 out of 100 machines were still functioning at the end of the test.
B.
Because of the extreme stress of the testing process, any model that has more than two-thirds of its machines functioning at the end of the test process is considered sufficiently durable for the consumer market.
C.
Most consumers will tolerate a washing machine that functions only 64 times out of 90 attempts.
D.
Although the model tested is less durable than other models on the market, its projected price is considerably lower than that of the most durable models.
E.
The electrical failure that brought down most of the 26 washing machines that ceased functioning could probably be avoided if the machine were redesigned.
【简答题】热继电器是利用电流的( )来工作的电器。
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