阀控式蓄电池的C3为C10的（）倍。
A、1
B、0.55
C、0.75
D、0.85
参考答案：C
---- Did he give you advice on your work yesterday?
---- Yes. But his advice, as a matter of fact, ______ my difficulty.
A．used to
B．related to
C．added to
D．belonged to
在全国60个港口综合竞争力指数排行榜中位列（），被业内评为“最具（）港口”。
A、第一
B、发展前景
C、第九
D、增长潜力
