原发性肝癌与肝脓肿有鉴别意义的检查是（）
A.肝肿大程度
B.肝区疼痛性质
C.右膈升高情况
D.甲胎蛋白测定
E.肝功能检查
参考答案：D
为保证接地后备最后一段保护可靠有选择地切除故障，220kV线路接地电阻考虑最大按为（）。
A.100Ω
B.150Ω
C.200Ω
D.300Ω
On a purchase of $120， a store offered a payment plan consisting of a $20 down payment and 12 monthly payments of $10 each. What percent of the purchase price， to the nearest tenth of a percent, did the customer pay in interest by using this plan ？（）
A.16.7%
B.30%
C.75.8%
D.106.7%
E.107.5%
