曲柄连杆机构由气缸体与曲轴箱组，活塞连杆组（）组成。
A.气门组
B.曲轴飞轮组
C.上、下曲轴箱
D.气缸体
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.
根据《汽车加油加气站设计与施工规范》GB50156-2012中的要求，CNG高压储气瓶距离铁路的安全间距应不小于（）。
A、22米
B、30米
C、50米
D、80米
