我国电梯曳引机减速箱大都采用（）蜗杆。
A.阿基米德螺旋线
B.延长渐开线
C.螺旋线
D.直线
参考答案：B
根据汉语提示写出单词。
1.The good news ______(传播)fast. We are very happy to hear it
2. You look ______(苍白), what's wrong with you?
3. Take this ______(药) three times a day.
4. He coughs _______(日日夜夜)
5.While we are in class, we should take an ______(活跃)part in all the activities.
柴油机燃料供给装置中，用（）来提高柴油机供油压力。
A.喷油器
B.高压油管
C.输油泵
D.喷油泵
