【判断题】空调噪声大的主要原因有压缩机噪声,风机噪声以及制冷剂过少引起膨胀阀发出噪声。
【单选题】核酸分子中核苷酸之间连接的方式是 ( )
【多选题】动物体内的主要蓄积部位(贮存库)有( )。
【单选题】-- When can I play computer games, Mum? --______ your homework _______.
B.
Not until, will be finished
D.
Not until, is finished
【简答题】在中国古代, 是当时世界上最进步的文字,今天的汉字就从它演变而来。
【简答题】It has been announced that candidates(应考者) ________ remain in their seats until all the papers have been collected. A.can B.will C.may D.shall
【单选题】If the demand for digital cameras increases when consumersʹ incomes rise, then digital cameras are
C.
a substitute for film cameras.
D.
a complement to film cameras.
E.
made using advanced technology.
【单选题】We observe that the equilibrium price of digital cameras has fallen and the equilibrium quantity of digital cameras has increased. Which of the following events could be responsible for this?
A.
Technological advances in digital camera production.
B.
Consumers' preferences changed in favor of digital cameras.
C.
The price of film cameras rose.
D.
Workers who make digital cameras received a pay raise.