营业部经理初次定级和调整职级时设试用期，试用期为（）个月，试用期满按照实际达成情况定级。
A.3
B.6
C.9
D.12
参考答案：B
It was ______ he does ______ makes his students enthusiastic about school.[ ]
A. that; that
B. what; what
C. that; what
D. what; that
X线吸收效率最低的增感屏是
A．钨酸钙
B．硫氧化镧
C．溴氧化镧
D．硫氧化钆
E．氟氯化钡
