___________ books do you have?[ ]
A. How much
B. How are
C. What's
D. How many
答案:D
50kg/m钢轨9号普通单开道岔全长为()。
A.28848mm
B.29569mm
C.36815mm
D.37907mm
下列配穴中属于原络配穴法的是
A.太渊、偏历
B.合谷、偏历
C.神门、灵道
D.丘墟、光明
E.太溪、大钟