A.It is not easy to see the shortage of experts in the villages.
B.Many doctors and engineers are sent to the villages to make up for the shortage of experts.
C.Expert medical systems are widely used in developing countries.
D.Expert systems are owned by wealthy farmers and businessmen.
第4题
A.运送炸药雷管等危险品
B.吊运大型设备
C.检修井筒
D.实习主提升机操作工开车
E.提升矸石
第7题
下列哪类设施可以不装设可靠的防坠器()。
A.升降人员单绳提升罐笼
B.升降人员和物料的单绳提升罐笼
C.带乘人间的箕斗
D.升降物料的罐笼
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