油田输油的特点不包括()。
A.输液量变化大
B.输送介质的黏度变化大
C.原油进入稳定装置前一般处于气饱和状态
D.原油集输系统长期间断运行
参考答案:D
Mother asked the youngest girl _____ with her toy car. [ ]
A. what the matter was
B. what was the matter
C. what the matter is
D. what is the matter
下列变化中,一定属于化学变化的是
①固体物质加入后全部变成气体
②粮食酿成酒
③爆炸
④用活性炭除去有毒气体
⑤植物的光合作用. [ ]
A.①②③⑤
B.②③④⑤
C.②⑤
D.⑤