θ≈57λ/2a为（）的公式。
A.圆晶片半扩散角
B.方晶片半扩散角
C.反射角
D.折射角
参考答案：B
The traffic rule says young children under age four and () less that 40 pounds must be in a child safety seat.
A. being weighed
B. to weigh
C. weighed
D. weighing
根据我国企业破产法，通过和解协议的决议须经出席会议的有表决权的债权人过半数同意，并且其所代表的债权额须占无财产担保债权总额的( )以上。
A．2／5
B．3／5
C．1／3
D．2／3
