经纱用DTY丝的主要质量要求包括()。
A、丝饼定重长度均匀
B、丝饼纵向染色均匀
C、丝饼生产过程张力稳定
D、严格按标准判色
参考答案:A, B, C, D
Hearing their grandpa was coming, they began to ________ the work to prepare for a nice dinner.
A.set off
B.set down
C.set aside
D.set about
配制100g 10%的盐酸,需要20%的盐酸(密度是1.1g/cm3)的体积与水的质量分别是( )
A.50 gmL 50 g
B.55mL 40.5 g
C.45.5 mL 50 g
D.45.5 mL 54.5 g