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【简答题】
. 简述普通细菌培养基的配制方法和过程。 (5分)
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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
【简答题】在液相色谱中,为改善分离度并调整出峰时间,可通过改变流动相( )和pH值的方法达到。
【简答题】简述装饰缝变化主要分割形式。
【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
【判断题】The formation of the Clerical Script is an important turning point in the evolution of Chinese characters because it lays a foundation for the squatter shape of the later script forms.
A.
正确
B.
错误
【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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