对转柱式门座起重机，水平轮单边径向磨损量最大不得超过（）。
A.2毫米
B.3毫米
C.5毫米
参考答案：C
With the new technique ______, the factory produced ______ family cars in 2009 as the year before.[ ]
A. to introduce; three times many as
B. introduced; three times as many
C. introducing; three times as many
D. being introduced; three times many as
强度等级为MU15的蒸压灰砂砖，其抗压强度单块值（）。
A.≥8.0Mpa
B.≥10.0Mpa
C.≥12.0Mpa
D.≥15.0Mpa
