修复过度磨损件,保证安全航行到下次计划修理的是()。
A.航修
B.小修
C.检修
D.事故修理
参考答案:B
While travelling, Peter never enjoys visiting large cities because he thinks one city is much like ________.[ ]
A. the other
B. another
C. the others
D. others
向BaCl2溶液中通入SO2至饱和,此过程看不到现象;再向溶液中加入一种物质,溶液变浑浊。加入的这种物质不可能是()
A.FeCl3溶液
B.AlCl3溶液
C.Na2S溶液
D.AgNO3溶液