用作防止外来物对背、腰部撞击伤害的躯体防护用品是：（）。
A.白帆布工作服
B.防砸背甲
C.防热服
参考答案：B
Which of the following choices indicates that your project is 9% under budget ？（）
A．The cumulative AC was 100, and the cumulative EV was 110
B．The cumulative PV was 100, and the cumulative AC was 110
C．The cumulative AC was 110, and the cumulative EV was 100
D．The cumulative EV was 100, and the cumulative PV was 110
读某岛屿示意图，回答下列各题。
该岛约有人口280万，则该岛的人口密度约为（）
A.150人/KM2
B.350人/KM2
C.250人/KM2
D.450人/KM2
