飞轮调速是因为它能()能量,装飞轮后以后,机器的速度波动可以减小。
A.生产
B.消耗
C.储存和放出
参考答案:C
Almost all the students were having classes when the earthquake _________.
A. broke out
B. put out
C. came out
D. got out
柴油机发生高温腐蚀的零件是()。
Ⅰ.气缸套;
Ⅱ.气缸盖;
Ⅲ.活塞环;
Ⅳ.排气阀;
Ⅴ.进气阀。
A.Ⅰ+Ⅱ+Ⅳ
B.Ⅱ+Ⅳ
C.Ⅰ+Ⅱ+Ⅲ+Ⅳ
D.Ⅱ+Ⅳ+Ⅴ