基质酸化时施工泵压要控制在低于地层破裂压力下泵注。
A. 正确
B. 错误
现打算参加居民大病医保,不知需缴费多少?还有参保后如何报销?
转K4转向架在组装、落成、使用中同一轮对车轮直径之差不超过()mm。
A. 0.5mm
B. 1mm
C. 1.5mm
D. 2mm
Fire in an engine compartment is best extinguished with carbon dioxide gas (CO2) and by().
A. completely closing the compartment
B. closing the compartment except for the ventilators
C. leaving the compartment open to the air
D. increasing the air flow to the compartment by blower