单项选择题普通铅蓄电池极板使用的材料是: A、正极板氧化铅,负极板铅 B、正极板铅,负极板锂 C、正极板硫酸铅,负极板铅 D、正极板氧化铅,负极板锌
单项选择题With a good command of English, he soon got ________ to working with British people.A) accustomed B) consistentC) relevantD) responsible
判断题IgG fold consists of a pair of β sheets, each built of antiparallel b strands, that surround a central hydrophobic core.()
单项选择题治痈疡剂分为散结消痈剂、托里透脓剂以及补虚敛疮剂三类。( )
判断题PLC面板上箭头向里的24伏直流电源,是为CPU供电电源。 正确 错误