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【多选题】
下列说法中正确的是A.
如果人离高速行驶的列车太近，会受到向列车方向的推力
B.
打乒乓球时的上旋球、下旋球现象与空气的存在有关，在真空中不会出现
C.
依据等效原理，加速运动的非惯性系中的力学现象与受到等效引力的惯性系中的现象相同
D.
因为太阳的质量比月亮大得多，所以由太阳引起的潮汐力比月亮引起的潮汐力大
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举一反三
【单选题】A typical trend during a recession is that:
A.
the unemployment rate falls.
B.
the popularity of the incumbent president rises
C.
incomes fall
D.
the inflation rate rises.
【单选题】A typical trend during a recession is that
A.
the unemployment rate falls.
B.
the popularity of die incumbent president rises.
C.
incomes fall.
D.
the inflation rate rises.
【单选题】During a recession the economy experiences
A.
rising employment and income.
B.
rising employment and falling income.
C.
rising income and falling employment
D.
falling employment and income.
【简答题】语法学里的词法和句法各研究些什么? 2.什么是语法体系? 3.举例说明语法的抽象性和稳固性。
【单选题】During a recession:
A.
unemployment and the growth rate of real GDP both decrease.
B.
unemployment decreases and the growth rate of real GDP increases.
C.
unemployment increases and the growth rate of real GDP decreases.
D.
there is no relation between unemployment and the growth rate of real GDP.
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