压力管道操作人员划分为6个级别,II-2级允许操作压力管道的级别为()。
A、GCl、GC2、GC3
B、GC2、GC3
C、GB2
D、GBl
参考答案:C
碳酸氢铵(NH4HCO3)是一种化学肥料,它属于( )
A.钾肥
B.磷肥
C.氮肥
D.复合肥
Five players ________a basketball team.[ ]
A. made up of
B. making up of
C. consists of
D. are consisted