当探测器接近金属物品时,磁场受干扰发生变化,()。
A.金属物品报警
B.中心频率漂移
C.频率漂移
D.灵敏度恒定
参考答案:C
看看你的应变能力,用所给单词的适当形式填空。
1.I can’t find the museum. What _____ I _____(do)?
2.I’m sorry I didn’t finish _____(write)my composition.
3.What time _____ Li Lei _____(get)up this morning?
4.Could you please _____ (pass)me those dumplings?
5.Mr White isn’t used to _____ (drink)tea.
6._____ we _____ (need) to buy some more chicken, mum?
7.Don’t let the students _____ (suffer)from lots of homework.
8.We have to _____ (get)there earlier than eight o’clock.
9.We’d like you _____ (play) volleyball with us.
10.I’m very upset and don’t know what _____ (do).
肺炎球菌肺炎治疗的首选抗生素是()。
A.红霉素
B.庆大霉素
C.氧氟沙星
D.青霉素G
E.林可霉素