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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】In 1967, in response to widespread public concern aroused by medical reports of asbestos(石棉绒) related deaths, NMRC organized a committee of enquiry to investigate the health threats ,associated with t...
A.
asbestos is damp
B.
dry asbestos is employed
C.
workers wear protective clothing
D.
workers use asbestos in the open air
【单选题】In 1967, in response to widespread public concern aroused by medical reports of asbestos(石棉绒) related deaths, NMRC organized a committee of enquiry to investigate the health threats ,associated with t...
A.
only when asbestos is used in building industry
B.
only when it is used in large quantities
C.
even if it is used in small quantities
D.
if they are used when wet rather than dry
【单选题】测定低发热量煤使用酸洗石棉绒，在使用前应在多少温度下灼烧多长时间？（）
A.
800 ℃，30 分钟
B.
815 ℃，30 分钟
C.
900 ℃，25 分钟
D.
920 ℃，20 分钟
【单选题】In 1967, in response to widespread public concern aroused by medical reports of asbestos(石棉绒) related deaths, NMRC organized a committee of enquiry to investigate the health threats ,associated with t...
A.
only when asbestos is used in building industry
B.
only when it is used in large quantities
C.
even if it is used in small quantities
D.
if they are used when wet rather than dry