【判断题】将某螺纹竖直放置,右侧牙低的为左旋螺纹。
【判断题】缺口使塑性材料得到“强化” ,因此,可以把“缺口强化”看作是强化材料的一种手段,提高材料的屈服强度。
【简答题】老花眼的产生原因主要是____,表现为近点____移,所以看近物时需带适当焦度的____透镜。
【单选题】世界上第一辆汽车是在( )年,由( )发明的。
【单选题】After this dialogue, there is a recorded question. The dialog and the question will be spoken only once. When you hear a question, you should choose the correct answer from the four choices marked A, ...
A.
Increase high blood pressure.
B.
Lower high blood pressure.
C.
Decrease high blood sugar.
D.
Inject in the vein of the patient.
【单选题】在择业、就业之前应当做好充分的思想准备,以下不正确的一项是:( )