滞胀意味着实际GDP停止增长甚至下降,而()
A、通货膨胀率下降
B、通货膨胀率上升
C、通货膨胀率保持稳定
D、通货紧缩
参考答案:B
Believe it or not, the Great Wall, which _______ by people, should be protected at once.
A.has been destroyed
B.is destroyed
C.was destroyed
D.is being destroyed
袋式收尘器按清灰装置的结构特点及工作原理分为()和()两类。