空气呼吸器压力报警后还能保证供气()分钟。
A.5;
B.10;
C.20;
D.80。
参考答案:B
下列属于服务品牌产品成本费用定价的是()
A、生产导向定价法
B、竞争导向定价法
C、固定成本费用
D、需求定价
Generous public funding of basic science would ________ a good many benefits for the country's
health, wealth and security.[ ]
A. result from
B. lead to
C. lie in
D. settle down