我国新生儿败血症最常见的病原菌是
A．葡萄球菌B．李斯特意单胞菌C．厌氧菌D．克雷白杆菌E．绿脓杆菌
参考答案：A
用单词适当形式填空。
1．I can't work the whole day so I should find a ___________ (兼职的) job.
2．While the little boy was walking down the street, the UFO ___________ (着陆).
3．Don't talk loudly. My father is sleeping in his ___________ (卧室).
4．The man fell off his bike and got ___________ (受伤的).
5．Don't ___________ (抄袭) your classmates' homework.
如果一个矩形空腔波导管内填满了相对介电常数为εr的电介质，那么其截止频率ωd与原没有填充介质的空腔的截止频率ω0之间的关系为：(脚标d和0分别表示电介质和真空)（）
A.
B.
C.
D.
