【单选题】对某电路中一个NPN型硅管进行测试,测得 ,则此管工作在( )。
【单选题】(4) 击球前对于身体的姿势易犯的错误中,哪种描述是错误的? (B)
【简答题】I. Contractions:1)_______ 2)_______ 3)_______ 4)_______
【判断题】水泥的抗拉强度较高,一般是抗压强度的10-20倍。()
【简答题】i. Contractions: 1. ________ 2. ________ 3. ________ 4. ________
【判断题】混凝土的特性是抗压强度低, 抗拉强度高, 脆性大。
【单选题】What does a man do when he cannot get exactly what he wants?
A.
He usually does not buy anything.
B.
At least two of his requirements must be met before he buys.
C.
He buys similar things of the colour he wants.
D.
So long as the style. is right, he buys the thing.