尖嘴钳主要用于二次小线工作,其钳口用来弯折线头或把线弯成圈以便接线螺丝,将它旋紧,也可用来夹持小零件。
参考答案:对
Not until _____ ten _____ to school.
A.was he; he went
B.was he; did he go
C.he was; he went
D.he was; did he go
()是木材物理力学性质发生变化的转折点。
A.纤维饱和点
B.平衡含水率
C.饱和含水率
D.A和B