【单选题】Seven graduates applied for the vacancy but only two __________.
【多选题】(多选)紫外可见分光光度计中紫外区常用的光源有( )
【简答题】“世界无烟日”是每年的( )月( )日。
【单选题】紫外可见分光光度计中,紫外区常用的吸收池是:
【判断题】一般情况下,脉冲当量越小,数控机床的加工精度和加工表面质量越高。( )
【单选题】Seven graduates applied for the vacancy but only two__.
【简答题】When she graduates from college this summer, she ________(study) here for seven years.