单体泵出口设回流管，一送料时可调节单体泵出口的压力，二送料前可通过回流管回收单体泵泵体内的氯乙烯气体。
参考答案：错
All his classmates________his happiness when he won first prize in the competition.[ ]
A. shared
B. shared from
C. shared with
D. shared like
最常用于确诊细菌性痢疾的检查是（）
A.粪便培养细菌
B.血液培养细菌
C.协同凝集试验
D.粪便涂片、染色镜检
E.粪便培养致病菌
