韶山3型电力机车牵引块与牵引梁体前后之间的最大间隙各为（）。
A.1mm
B.1.5mm
C.2mm
D.2.5mm
参考答案：C
The company used 50 percent of the raw materials, the rest of which __________ sent to other cities to help the factories there.
A．is
B．was
C．are
D．were
特克斯是指（）长的纱线，在公定回潮率时的重量。
A.1000m
B.9000m
C.3000m
