由于冷轧板带厚度可以存在负差，因此冷轧板带宽度也可以存在负差。
参考答案：错
With the development of Chinese economy, many unexpected problems have ________; for example, the prices of our daily goods and housing are ________ sharply.
A．arisen; rising
B．arisen; raising
C．raised; rising
D．risen; arising
家蚕的完全变态发育过程是指（ ）
A．卵→蛹→成虫
B．幼虫→成虫
C．卵→幼虫→蛹→成虫
D．卵→蛹→成虫
