矿井应当分井、分水平设观测站进行涌水量的观测，每月观测次数不少于（）次。对于水质的监测每年不少于（）次，丰、枯水期各（）次。
参考答案：3；2；1
Students who pass the test will be ______ to the next grade, as has been announced.
A．possessed
B．promoted
C．proposed
D．appealed
系统性红斑狼疮所产生的胸腔积液为（）
A.漏出液
B.渗出液
C.脓性胸液
D.血性胸液
E.乳糜性胸液
