传播疟疾最重要的是()
A.伊蚊
B.按蚊
C.库蚊
D.体虱
E.蚤类
参考答案:B
New technologies have made ____ possible to turn out new products faster and at a lower cost. [ ]
A. that
B. this
C. one
D. it
某运输企业投资一项目,预计6年后可获利800万元。按年利率12%计算,这笔收益的现值是( )万元。
A.428.28
B.415.28
C.405.28
D.438.28