水泵在出现()情况之一时应立即停机。
A、水泵不吸水;
B、管线、阀门、止回阀、发生爆裂;
C、轴承温度过高或轴承烧毁;
D、突然发生强烈振动和噪音。
参考答案:A, B, C, D
mRF与下列物质的亲和力的程度应是()
A.对IC、聚合IgG很低,对变性IgG很高,
B.对IC、变性IgG及聚合IgG均很高
C.对IC及变性IgG很低,对聚合IgG很高
D.对IC很高,对变性IgG及聚合IgG很低
E.对IC、变性IgG及聚合IgG很低
— Oh. Mary's not here these days. Is she ill?
— _____. Her mother told me that she was in hospital. [ ]
A. I am afraid so
B. I hope not
C. I don't mind
D. I don't think so