单项选择题

MVC设计模式将应用程序分为( )部分。
A、2
B、3
C、4
D、5

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单项选择题

Which of the following is correct?
A、Economic fluctuations are easily predicted by competent economists.
B、Recessions have never occurred very close together.
C、Spending, income, and production do not fluctuate closely with real GDP.
D、None of the answers is correct.

多项选择题

GPS卫星定位系统属网络式防盗器，它主要靠锁定（）或（）达到防盗的目的。

A．点火
B．加速
C．起动