【简答题】四种常规热处理中, 最终热处理有 __________ 、 __________ 。
【简答题】长江和黄河共同流经的省区是______和______.都流经的区域是______.
【单选题】——How long has his father ________London? ——For two weeks.
【单选题】Mary has been away from her hometown three years.
【单选题】关于平滑面牙釉质龋显微镜下所见哪项是错误的
B.
牙釉质龋继续发展,牙釉质深层受累,病损区呈三角形
E.
在三角形病损处,可见淡棕黄色色素沉着,其边缘处颜色较深
【单选题】Before entering a fuel tank that has been cleaned, it should be checked with an oxygen indicator and a/an ____.
D.
combustible gas indicator
【判断题】长江、黄河共同流经的省份是青海省和四川省。( )