橡胶垫板压溃或变形,两侧压宽合计:厚度为10mm的橡胶垫板超过20mm应进行更换。
参考答案:对
We ________John's name on the race list yesterday but for his recent
injury.(2011·江西)
A.will put
B.will have put
C.would put
D.would have put
除去Fe2O3固体中少量的Al2O3杂质,可选用的试剂是
A.稀盐酸
B.NaOH溶液
C.氨水
D.稀硝酸