弯销侧抽芯机构可以获得比用斜导柱侧抽芯机构（）抽芯距。
A.小的
B.相同的
C.大的
D.不确定
参考答案：C
Their products enjoy 30 percent _____ of the market in this country because both the quality and their
service are fine. [ ]
A. features
B. shares
C. interests
D. sales
测量锅炉空气流量时最好使用（）。
A.靶式流量计
B.标准喷嘴
C.标准孔板
D.翼形动压管
