有自然发火可能性的矿井，主要运输巷道应布置在（）内，并采用预防性灌浆或者其他有效预防自然发火的措施。
查看答案
In a chilled water air conditioning unit using a reciprocating compressor, the refrigerating effect of the primary refrigerant can be increased by （）.
A. increasing refrigerant pressure in the coil
B. increasing chilled water flow through the cooler
C. sub-cooling the refrigerant in the condenser
D. superheating the refrigerant in the compressor
“阿维农之囚”是中世纪教俗之争的分水岭
A. 正确
B. 错误
微信支付 
支付宝支付