关于空压机下列说法中错误的是()。
A.滑油冷却温度越低越好
B.冷却滑油可延缓油的氧化变质
C.冷却滑油可帮助摩擦面散热
D.滑油冷却应使油温保持在70℃以下
参考答案:A
用所给动词的适当形式填空。
1. By the time I _____ (get) up, my brother _____ ( get, already) in the shower.
2. By the time she _____ (get) to class, the teacher _____ (start, already) teaching.
3. When she _____ (get) to school, she _____ (realize) she _____(leave) her backpack at home.
4. — _____ you ever _____ (be) late for school?
—Yes, I have.
—Why _____ you late?
—Because the bus _____ (break) down.
药物的血浆清除率是:
A.单位时间内从血浆中清除的药物所占的血浆容积
B.单位时间内被肾脏排泄的药物量
C.单位时间内按比例从血浆中清除的药量
D.单位时间内被肝脏代谢的药物量
E.单位时间内从血浆中清除的药量