下列属于过氧化物类药物的是()
A.次氯酸钠
B.吡喹酮
C.高锰酸钾
D.聚维酮碘
参考答案:C
Knowledge and learning are important if we want to be successful, but they may also ______ our thinking.
A.direct
B.limit
C.change
D.improve
金属材料抵抗冲击载荷而不破坏的性能叫()
A、弹性
B、韧性
C、裂性
D、延伸率