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举一反三
【单选题】Suppose that the demand curve for desktop computers shifts rightward and at the same time the supply curve shifts leftward. Which of the following could have caused these shifts?
A.
Desktop computers are a normal good and incomes increased, while more firms entered the market.
B.
The price of a laptop computer, a substitute for desktop computers, fell and the cost of producing desktop computers decreased.
C.
Consumers purchased more computers because of the Christmas season and the labor costs of producing desktop computers decreased.
D.
Desktop computers are a normal good and incomes increased, while the labor costs of producing personal computers increased.
E.
Desktop computers are a normal good and incomes decreased, while the labor costs of producing personal computers increased.
【判断题】《建筑施工高处作业安全技术规范强制性条文》规定，暴风雪及台风暴雨后，应对高处作业安全设施逐一加以检查，发现有松动、变形、损坏或脱落等现象，应立即修理完善。
A.
正确
B.
错误
【简答题】All the desktop computers are ________to the printer.
【简答题】岩石是一种或多种矿物或岩屑组成的集合体,按其成因分成岩浆岩、沉积岩和()三大类。
【简答题】暴风雪及台风、暴风雨后，应对高处作业安全设施逐一加以检查，发现有何种现象应立即修理完善?() A.脱落 B.松动 C.变形 D.损坏
【简答题】阿士大夫干撒啊爱上过安顺
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