重机作业中如遇六级及以上大风或阵风，应立即停止作业，锁紧夹轨器，将回转机构的制动器制动住，起重臂不能随意转动。
参考答案：错
The boss said we had only three days to finish the work.
Don’t worry. We have already ____? two thirds of it.
A．got down
B．got through
C．given in
D．given away
基材为锌板的（）重量是采用电解法测定。
A.膜层
B.双金属层
C.胶粘层
D.蜡层
