教师专业化的关键是( )。
A．建立教师职业准入制度
B．建立从业教师的管理制度
C．完善教师教育制度
D．规范学校专业生活
参考答案：A
Packet-switching wireless networks are preferable (41) when transmissions are (42) because of the way charges are (43) per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are (44) for the (45) of time they use the net-work.
A．charged
B．fined
C．free
D．controlled
噻嗪类利尿剂中，属于水溶性的药物是（）。
A.氯噻嗪
B.氢氯噻嗪
C.苄噻嗪
D.氢氟噻嗪
E.环戊噻嗪
