在聚合物驱油过程中,要求每()对注入水、配制站聚合物用水的水质(矿化度、含铁量)及水中含氧量进行监测。分析水质变化情况。
A、一个月
B、半个月
C、三天
D、七天
参考答案:D
导线或地线的最大使用张力,应不大于绞线瞬时破坏张力的( )。
A.80% B.60% C.500% D.40%
单词拼写
用所给动词的适当形式填空
小题1:Look, there are so many people over there. What ____(happen)?
小题2:It’s seven in the morning. It’s time for us ____(go) to school.
小题3:Look at the clouds in the sky. I think it ____(rain).
小题4:___(be) everyone here? Yes, Let’s ___(start) now.
小题5:He ___(be) be fifty years old next month. But he ___(look) so young.
小题6:Teachers’ Day ___(come) . And we ___(plan) to buy some flowers for Mrs. Li.
小题7:My mother usually ____(shop) for food on Sundays.