原油集输设备长期暴露在空气中,易受环境大气中()等物质的综合作用影响产生腐蚀。
A、水
B、氧气
C、氮气
D、酸性氧化物
参考答案:A, B, D
如果一国本位制度中规定货币单位受()的约束,则称为规范本位制。
A.国家法律
B.等量金属或他国货币等价
C.国家货币政策
D.国家货币制度
—Your sister nearly _______ all her spare time to her study during the three years.
—That's right, or she ________ the first place in her school in the examination.
A.devoted; wouldn't have taken
B.spent; wouldn't have taken
C.had devoted; hadn't taken
D.had spent; couldn't take