滚装客船备用应急照明规定一切电源断电后，有关通道等在任何横倾下至少工作3小时。
参考答案：对
用所给单词的适当形式填空
1. It's seven o'clock. Let's start _____(have) dinner.
2. I met an old friend while _____(walk) on the street.
3. It's too _____(noise) here. Let's go somewhere quiet.
4. It's rude _____(stick) your chopsticks into your food.
5. Who is _____(young) student in your class?
锤式碎煤机的锤头材料一般为（）。
A.铸铁；
B.铸钢；
C.铸锰钢；
D.不锈钢。
