确定支气管扩张诊断、类型及范围的最佳选择是
A．高分辨力CT
B．MRI
C．X线
D．支气管造影
E．常规CT
参考答案：A
A clean environment can help the city bid for the Olympic, which __________ will promote its
economic development.[ ]
A. in nature
B. in return
C. in turn
D. in fact
下列化学用语书写正确的是
A．氯化钙：CaCl
B．二氧化硫中硫元素显+4价：O2
C．2个氢分子：2H
D．镁离子：Mg+2
O2