在水泥标号中用大写字母()表示早强型水泥。
A.S;
B.R;
C.Z;
D.Q。
参考答案:B
Those eggs ______ , please throw them away.
A.smell good
B.are smelled bad
C.are smelled well
D.smell bad
SW-220K型转向架空气弹簧高度为()。(t为调整垫厚度)
A.300+t±3mm
B.320+t±3mm
C.340+t±3mm
D.280+t±3mm