矿井提升系统按用途可分为主井提升系统和副井提升系统。
参考答案:对
The mayor is strongly opposed to _____ a new hall, which may cost a lot of money.
A.building
B.build
C.be building
D.have built
放射变应原吸附试验(RAST)检测血清IgE水平时,以下描述正确的是()
A.固相载体包被抗IgE抗体
B.主要用于检测血清总IgE水平
C.放射性核素标记在变应原上
D.能替代皮肤试验和(或)激发试验
E.能定量检测血清中特异性IgE水平