箱体内的螺纹连接件,通常采用()来锁紧放松。
A.锁紧螺母
B.弹簧垫圈
C.串联钢丝
参考答案:A
31.7÷0.63(保留2位小数)
2.4×1.5+3.6÷1.5
0.32×0.25+0.08÷4
(9.6+1.48÷3.7)÷8
5.8÷[4×(1.34-0.14)]
5.4÷[0.51÷(1.2-1.03)].
The film was set in a town _____ is now part of Jiangsu Province.
A.where
B.which
C.what
D.it