制定起重作业方案,被吊物的重量一般可依据说明书、标牌或货物单确定,也可()来确定。
A、根据经验
B、用计算方法
参考答案:B
First impressions are the most lasting. After all, you never get _____ second chance to make _____ first
impression. [ ]
A. a; the
B. the; the
C. a; a
D. the ; a
按照肥料的特点:养分单一、肥分高、肥效快的肥料是()
A.微生物肥料;
B.农家肥料;
C.化学肥料;
D.复合肥;