根据投资目标划分，证券投资基金可分为（）。
A.衍生基金
B.成长型基金
C.收入型基金
D.平衡型基金
参考答案：B, C, D
Jack’s business is not as good as before, so he has to __________ the expenses(开销) of his company.
A．cut off
B．cut away
C．cut up
D．cut down
BI002GB/T12459—2005《钢制对焊无缝管件》标准规定，公称直径为100mm的90°弯头中心至两端尺寸偏差为（）。
A.±2mm
B.±lmm
C.±1.5mm
D.±2.5mm
