用游标为50分度的卡尺(测量值可精确到0.02 mm)测定某圆筒的内径时,卡尺上的示数如图1-8-2所示,可读出圆筒的内径为__________mm.
We can't _____ one to change the habits of a lifetime in a short time. A. hope B. wait C. expect D. imagine
(理)若复数z满足对应关系f(1-z)=2z-i,则(1+i)·f(1-i)等于A.1+i B.-1+i C.2 D.0
单项选择。 I _______ join in the ping-pong game next Friday. A. am going B. am going to C. would D. going to
Camping wild is a wonderful way to experience the natural world and , at its best, it makes little environmental influence .But with increasing numbers of people wanting to escape into the wilderness,
苯甲酸( )可用做食品防腐剂,其酸性比醋酸强。下列对苯甲酸性质的推测不合理的是( )A.苯甲酸溶液的pH小于7B.苯甲酸溶液的pH大于 7C.苯甲
明代沉船“南澳一号”发掘引起社会关注,学生以此为题进行研究性学习,搜集的一条史料是:“(明中后期,有大臣)请开市舶,易私贩而为公贩……不
21.补写出下列句子中的空缺部分。 (1)在“学与思”的关系上,孔子认为“学而不思则罔,思而不学则殆”,荀子在《劝学》中则认为“________________